Improve temperature runaway, idle timeout (#19339)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/feature/pause.cpp

   // Start the heater idle timers
   const millis_t nozzle_timeout = SEC_TO_MS(PAUSE_PARK_NOZZLE_TIMEOUT);
 
-  HOTEND_LOOP() thermalManager.hotend_idle[e].start(nozzle_timeout);
+  HOTEND_LOOP() thermalManager.heater_idle[e].start(nozzle_timeout);
 
   #if ENABLED(DUAL_X_CARRIAGE)
     const int8_t saved_ext        = active_extruder;
 
     // If the nozzle has timed out...
     if (!nozzle_timed_out)
-      HOTEND_LOOP() nozzle_timed_out |= thermalManager.hotend_idle[e].timed_out;
+      HOTEND_LOOP() nozzle_timed_out |= thermalManager.heater_idle[e].timed_out;
 
     // Wait for the user to press the button to re-heat the nozzle, then
     // re-heat the nozzle, re-show the continue prompt, restart idle timers, start over
       // Start the heater idle timers
       const millis_t nozzle_timeout = SEC_TO_MS(PAUSE_PARK_NOZZLE_TIMEOUT);
 
-      HOTEND_LOOP() thermalManager.hotend_idle[e].start(nozzle_timeout);
+      HOTEND_LOOP() thermalManager.heater_idle[e].start(nozzle_timeout);
       TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, PSTR("Reheat Done"), CONTINUE_STR));
       TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired_P(PSTR("Reheat finished.")));
       wait_for_user = true;
   // Re-enable the heaters if they timed out
   bool nozzle_timed_out = false;
   HOTEND_LOOP() {
-    nozzle_timed_out |= thermalManager.hotend_idle[e].timed_out;
+    nozzle_timed_out |= thermalManager.heater_idle[e].timed_out;
     thermalManager.reset_hotend_idle_timer(e);
   }
 

Marlin/src/inc/Conditionals_adv.h

   #undef SHOW_TEMP_ADC_VALUES
 #endif
 
+#if TEMP_SENSOR_BED == 0
+  #undef THERMAL_PROTECTION_BED
+  #undef THERMAL_PROTECTION_BED_PERIOD
+#endif 
+
+#if TEMP_SENSOR_CHAMBER == 0
+  #undef THERMAL_PROTECTION_CHAMBER
+#endif
+
 #if ENABLED(MIXING_EXTRUDER) && (ENABLED(RETRACT_SYNC_MIXING) || BOTH(FILAMENT_LOAD_UNLOAD_GCODES, FILAMENT_UNLOAD_ALL_EXTRUDERS))
   #define HAS_MIXER_SYNC_CHANNEL 1
 #endif

Marlin/src/lcd/HD44780/ultralcd_HD44780.cpp

 
 FORCE_INLINE void _draw_heater_status(const heater_id_t heater_id, const char prefix, const bool blink) {
   #if HAS_HEATED_BED
-    const bool isBed = heater_id < 0;
+    const bool isBed = TERN(HAS_HEATED_CHAMBER, heater_id == H_BED, heater_id < 0);
     const float t1 = (isBed ? thermalManager.degBed()       : thermalManager.degHotend(heater_id)),
                 t2 = (isBed ? thermalManager.degTargetBed() : thermalManager.degTargetHotend(heater_id));
   #else
   #if !HEATER_IDLE_HANDLER
     UNUSED(blink);
   #else
-    const bool is_idle = (
-      #if HAS_HEATED_BED
-        isBed ? thermalManager.bed_idle.timed_out :
-      #endif
-      thermalManager.hotend_idle[heater_id].timed_out
-    );
-
-    if (!blink && is_idle) {
+    if (!blink && thermalManager.heater_idle[thermalManager.idle_index_for_id(heater_id)].timed_out) {
       lcd_put_wchar(' ');
       if (t2 >= 10) lcd_put_wchar(' ');
       if (t2 >= 100) lcd_put_wchar(' ');
 }
 
 FORCE_INLINE void _draw_bed_status(const bool blink) {
-  _draw_heater_status(H_BED, (
-      #if HAS_LEVELING
-        planner.leveling_active && blink ? '_' :
-      #endif
-      LCD_STR_BEDTEMP[0]
-    ),
-    blink
-  );
+  _draw_heater_status(H_BED, TERN0(HAS_LEVELING, blink && planner.leveling_active) ? '_' : LCD_STR_BEDTEMP[0], blink);
 }
 
 #if HAS_PRINT_PROGRESS
 
   FORCE_INLINE void _draw_print_progress() {
     const uint8_t progress = ui.get_progress_percent();
-    lcd_put_u8str_P(PSTR(
-      #if ENABLED(SDSUPPORT)
-        "SD"
-      #elif ENABLED(LCD_SET_PROGRESS_MANUALLY)
-        "P:"
-      #endif
-    ));
+    lcd_put_u8str_P(PSTR(TERN(SDSUPPORT, "SD", "P:")));
     if (progress)
       lcd_put_u8str(ui8tostr3rj(progress));
     else

Marlin/src/lcd/dogm/status_screen_DOGM.cpp

 
     if (PAGE_UNDER(7)) {
       #if HEATER_IDLE_HANDLER
-        const bool dodraw = (blink || !thermalManager.hotend_idle[heater_id].timed_out);
+        const bool dodraw = (blink || !thermalManager.heater_idle[heater_id].timed_out);
       #else
         constexpr bool dodraw = true;
       #endif
 
     if (PAGE_UNDER(7)) {
       #if HEATER_IDLE_HANDLER
-        const bool dodraw = (blink || !thermalManager.bed_idle.timed_out);
+        const bool dodraw = (blink || !thermalManager.heater_idle[thermalManager.IDLE_INDEX_BED].timed_out);
       #else
         constexpr bool dodraw = true;
       #endif

Marlin/src/lcd/dogm/ultralcd_DOGM.cpp

       lcd_put_u8str(i16tostr3rj(thermalManager.degHotend(extruder)));
       lcd_put_wchar('/');
 
-      if (get_blink() || !thermalManager.hotend_idle[extruder].timed_out)
+      if (get_blink() || !thermalManager.heater_idle[extruder].timed_out)
         lcd_put_u8str(i16tostr3rj(thermalManager.degTargetHotend(extruder)));
     }
 

Marlin/src/lcd/extui/ui_api.cpp

 
   bool isHeaterIdle(const extruder_t extruder) {
     #if HAS_HOTEND && HEATER_IDLE_HANDLER
-      return thermalManager.hotend_idle[extruder - E0].timed_out;
+      return thermalManager.heater_idle[extruder - E0].timed_out;
     #else
       UNUSED(extruder);
       return false;
   bool isHeaterIdle(const heater_t heater) {
     #if HEATER_IDLE_HANDLER
       switch (heater) {
-        TERN_(HAS_HEATED_BED, case BED: return thermalManager.bed_idle.timed_out);
+        TERN_(HAS_HEATED_BED, case BED: return thermalManager.heater_idle[thermalManager.IDLE_INDEX_BED].timed_out);
         TERN_(HAS_HEATED_CHAMBER, case CHAMBER: return false); // Chamber has no idle timer
         default:
-          return TERN0(HAS_HOTEND, thermalManager.hotend_idle[heater - H0].timed_out);
+          return TERN0(HAS_HOTEND, thermalManager.heater_idle[heater - H0].timed_out);
       }
     #else
       UNUSED(heater);

Marlin/src/lcd/language/language_cz.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("TEPL. ÚNIK KOMORA");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("VYSOKÁ TEPLOTA");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("NÍZKA TEPLOTA");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("VYS. TEPL. PODL.");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("NÍZ. TEPL. PODL.");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Err: MAXTEMP KOMORA");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Err: MINTEMP KOMORA");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("TISK. ZASTAVENA");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Proveďte reset");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d");

Marlin/src/lcd/language/language_da.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY                 = _UxGT("Temp løber løbsk");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Fejl: Maks temp");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Fejl: Min temp");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Fejl: Maks Plade temp");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Fejl: Min Plade temp");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("PRINTER STOPPET");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Reset Venligst");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d"); // Kun et bogstav

Marlin/src/lcd/language/language_de.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("GEH.") " " LCD_STR_THERMOMETER _UxGT(" NICHT ERREICHT");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = " " LCD_STR_THERMOMETER _UxGT(" ÜBERSCHRITTEN");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = " " LCD_STR_THERMOMETER _UxGT(" UNTERSCHRITTEN");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("BETT ") LCD_STR_THERMOMETER _UxGT(" ÜBERSCHRITTEN");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("BETT ") LCD_STR_THERMOMETER _UxGT(" UNTERSCHRITTEN");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Err:Gehäuse max Temp");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Err:Gehäuse min Temp");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("DRUCKER GESTOPPT");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Bitte neustarten");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("t"); // One character only

Marlin/src/lcd/language/language_el.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY                 = _UxGT("ΔΙΑΦΥΓΗ ΘΕΡΜΟΚΡΑΣΙΑΣ");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("ΠΕΡΙΤΗ ΘΕΡΜΟΚΡΑΣΙΑ");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("ΜΗ ΕΠΑΡΚΗΣ ΘΕΡΜΟΚΡΑΣΙΑΣ"); //SHORTEN
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("ΜΕΓΙΣΤΗ ΘΕΡΜΟΚΡΑΣΙΑΣ ΕΠ. ΕΚΤΥΠΩΣΗΣ"); //SHORTEN
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("ΕΛΑΧΙΣΤΗ ΘΕΡΜΟΚΡΑΣΙΑΣ ΕΠ. ΕΚΤΥΠΩΣΗΣ"); //SHORTEN
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("H εκτύπωση διακόπηκε");
   PROGMEM Language_Str MSG_HEATING                         = _UxGT("Θερμαίνεται…");
   PROGMEM Language_Str MSG_BED_HEATING                     = _UxGT("Θέρμανση ΕΠ. Εκτύπωσης"); //SHORTEN

Marlin/src/lcd/language/language_el_gr.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY                 = _UxGT("ΔΙΑΦΥΓΗ ΘΕΡΜΟΤΗΤΑΣ");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Λάθος: ΜΕΓΙΣΤΗ ΘΕΡΜΟΤΗΤΑ");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Λάθος: ΕΛΑΧΙΣΤΗ ΘΕΡΜΟΤΗΤΑ");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Λάθος: ΜΕΓΙΣΤΗ ΘΕΡΜΟΤΗΤΑ ΚΛΙΝΗΣ");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Λάθος: ΕΛΑΧΙΣΤΗ ΘΕΡΜΟΤΗΤΑ ΚΛΙΝΗΣ");
   PROGMEM Language_Str MSG_HEATING                         = _UxGT("Θερμαίνεται…");
   PROGMEM Language_Str MSG_BED_HEATING                     = _UxGT("Θέρμανση κλίνης…");
   PROGMEM Language_Str MSG_DELTA_CALIBRATE                 = _UxGT("Βαθμονόμηση Delta");

Marlin/src/lcd/language/language_en.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("CHAMBER T. RUNAWAY");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Err: MAXTEMP");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Err: MINTEMP");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Err: MAXTEMP BED");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Err: MINTEMP BED");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Err: MAXTEMP CHAMBER");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Err: MINTEMP CHAMBER");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("PRINTER HALTED");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Please Reset");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d"); // One character only

Marlin/src/lcd/language/language_es.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("FUGA TÉRMICA CAMARA");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Err:TEMP. MÁX");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Err:TEMP. MIN");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Err:TEMP. MÁX CAMA");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Err:TEMP. MIN CAMA");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Err:TEMP. MÁX CÁMARA");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Err:TEMP. MIN CÁMARA");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("IMPRESORA DETENIDA");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Por favor, reinicie");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d"); // One character only

Marlin/src/lcd/language/language_eu.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY                 = _UxGT("TENP. KONTROL EZA");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Err: Tenp Maximoa");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Err: Tenp Minimoa");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Err: Ohe Tenp Max");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Err: Ohe Tenp Min");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("INPRIMA. GELDIRIK");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Berrabia. Mesedez");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d"); // One character only

Marlin/src/lcd/language/language_gl.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("FUGA TÉRMICA CÁMARA");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Erro:TEMP MÁX");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Erro:TEMP MÍN");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Erro:TEMP MÁX CAMA");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Erro:TEMP MÍN CAMA");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Erro:TEMP MÁX CÁMARA");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Erro:TEMP MÍN CÁMARA");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("IMPRESORA DETIDA");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Debe reiniciar!");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d"); // One character only

Marlin/src/lcd/language/language_hu.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("KAMRA FÜTÉS KIMARADÁS");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Hiba: MAX Höfok");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Hiba: MIN Höfok");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Hiba: MAX ÁGY HÖFOK");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Hiba: MIN ÁGY HÖFOK");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Hiba: MAX KAMRA HÖFOK");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Hiba: MIN KAMRA HÖFOK");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("A NYOMTATÓ LEFAGYOTT");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Indítsd újra!");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("n"); // Csak egy karakter

Marlin/src/lcd/language/language_it.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("T.CAMERA FUORI CTRL");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Err: TEMP MASSIMA");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Err: TEMP MINIMA");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Err: TEMP MAX PIATTO");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Err: TEMP MIN PIATTO");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Err: TEMP MAX CAMERA");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Err: TEMP MIN CAMERA");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("STAMPANTE FERMATA");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Riavviare prego");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("g"); // Un solo carattere

Marlin/src/lcd/language/language_jp_kana.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY                 = _UxGT("ネツボウソウ");                   // "THERMAL RUNAWAY"
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("エラー:サイコウオンチョウカ");         // "Err: MAXTEMP"
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("エラー:サイテイオンミマン");          // "Err: MINTEMP"
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("エラー:ベッド サイコウオンチョウカ");    // "Err: MAXTEMP BED"
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("エラー:ベッド サイテイオンミマン");     // "Err: MINTEMP BED"
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("プリンターハテイシシマシタ");         // "PRINTER HALTED"
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("リセットシテクダサイ");              // "Please reset"
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d");                          // One character only

Marlin/src/lcd/language/language_nl.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY                 = _UxGT("Therm. wegloop");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Err: Max. temp");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Err: Min. temp");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Err: Max.tmp bed");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Err: Min.tmp bed");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("PRINTER GESTOPT");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Reset A.U.B.");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d"); //  One character only. Keep English standard

Marlin/src/lcd/language/language_pl.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("ZANIK TEMP.KOMORY");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Błąd: MAXTEMP");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Błąd: MINTEMP");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Błąd: MAXTEMP STÓŁ");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Błąd: MINTEMP STÓŁ");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Błąd: MAXTEMP KOMORA");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Błąd: MINTEMP KOMORA");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("Drukarka zatrzym.");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Proszę zresetować");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d"); // One character only

Marlin/src/lcd/language/language_pt.h

   PROGMEM Language_Str MSG_HEATING_FAILED_LCD              = _UxGT("Aquecimento falhou");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Err: T Máxima");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Err: T Mínima");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Err: T Base Máxima");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Err: T Base Mínima");
   PROGMEM Language_Str MSG_HEATING                         = _UxGT("Aquecendo...");
   PROGMEM Language_Str MSG_BED_HEATING                     = _UxGT("Aquecendo base...");
   PROGMEM Language_Str MSG_DELTA_CALIBRATE                 = _UxGT("Calibração Delta");

Marlin/src/lcd/language/language_pt_br.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("ESCAPE TÉRMICO CAMARA");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Erro:Temp Máxima");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Erro:Temp Mínima");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Erro:Temp Mesa Máx");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Erro:Temp Mesa Mín");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Erro:Temp Câmara Máx");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Erro:Temp Câmara Min");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("IMPRESSORA PAROU");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Favor resetar");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d");

Marlin/src/lcd/language/language_ro.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("CHAMBER T. RUNAWAY");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Err: MAXTEMP");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Err: MINTEMP");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Err: MAXTEMP BED");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Err: MINTEMP BED");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Err: MAXTEMP CHAMBER");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Err: MINTEMP CHAMBER");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("PRINTER HALTED");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Please Reset");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d"); // One character only

Marlin/src/lcd/language/language_ru.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("УТЕЧКА ТЕПЛА КАМЕРЫ");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Ошибка: Т макс.");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Ошибка: Т мин.");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Ошибка: Т стола макс");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Ошибка: Т стола мин.");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Ошибка:Т камеры макс");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Ошибка:Т камеры мин.");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("ПРИНТЕР ОСТАНОВЛЕН");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Сделайте сброс");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("д"); // One character only

Marlin/src/lcd/language/language_sk.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("TEPLOTNÝ SKOK KOMO.");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Chyba: MAXTEMP");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Chyba: MINTEMP");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Chyba: MAXTEMP PODL.");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Chyba: MINTEMP PODL.");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Chyba: MAXTEMP KOMO.");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Chyba: MINTEMP KOMO.");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("TLAČIAREŇ ZASTAVENÁ");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Reštartuje ju");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("d");

Marlin/src/lcd/language/language_tr.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("ODA TERMAL PROBLEM");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Hata: MAX.SICAKLIK");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Hata: MIN.SICAKLIK");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Hata: MAX.SIC. TABLA");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Hata: MIN.SIC. TABLA");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("Hata: MAX.SIC ODA");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("Hata: MIN.SIC ODA");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("YAZICI DURDURULDU");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Lütfen Resetleyin");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("G"); // One character only

Marlin/src/lcd/language/language_uk.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("ВИТІК ТЕПЛА КАМЕРИ");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("ПЕРЕГРІВ");
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("МІНІМАЛЬНА Т") LCD_STR_DEGREE;
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("ПЕРЕГРІВ СТОЛУ");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("МІНІМАЛЬНА Т") LCD_STR_DEGREE _UxGT(" СТОЛУ");
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("ПЕРЕГРІВ КАМЕРИ");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("МІНІМАЛЬНА Т") LCD_STR_DEGREE _UxGT(" КАМЕРИ");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("ПРИНТЕР ЗУПИНЕНО");
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Перезавантажте");
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("д"); // One character only

Marlin/src/lcd/language/language_vi.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_BED             = _UxGT("Vấn đề nhiệt bàn");                     // BED THERMAL RUNAWAY
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("Điều sai: nhiệt độ tối đa");            // Err: MAXTEMP
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("Điều sai: nhiệt độ tối thiểu");         // Err: MINTEMP
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("Điều sai: nhiệt độ bàn tối đa");        // Err: MAXTEMP BED
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("Điều sai: nhiệt độ bàn tối thiểu");     // Err: MINTEMP BED
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("MÁY IN ĐÃ DỪNG LẠI");                   // PRINTER HALTED
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("Xin bặt lại");                          // Please reset
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("n");                                    // d - ngày - One character only

Marlin/src/lcd/language/language_zh_CN.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("机箱热量失控");
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("错误：最高温度");     //"Err: MAXTEMP"
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("错误：最低温度");     //"Err: MINTEMP"
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("错误：最高热床温度");     //"Err: MAXTEMP BED"
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("错误：最低热床温度");     //"Err: MINTEMP BED"
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("错误：最高机箱温度");
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("错误：最低机箱温度");
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("打印停机");     //"PRINTER HALTED"
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("请重置");     //"Please reset"
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("天");     //"d" // One character only

Marlin/src/lcd/language/language_zh_TW.h

   PROGMEM Language_Str MSG_THERMAL_RUNAWAY_CHAMBER         = _UxGT("機箱溫度失控");   //"CHAMBER T. RUNAWAY"
   PROGMEM Language_Str MSG_ERR_MAXTEMP                     = _UxGT("錯誤：最高溫度");     //"Err: MAXTEMP"
   PROGMEM Language_Str MSG_ERR_MINTEMP                     = _UxGT("錯誤：最低溫度");     //"Err: MINTEMP"
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_BED                 = _UxGT("錯誤：最高熱床溫度");     //"Err: MAXTEMP BED"
-  PROGMEM Language_Str MSG_ERR_MINTEMP_BED                 = _UxGT("錯誤：最低熱床溫度");     //"Err: MINTEMP BED"
-  PROGMEM Language_Str MSG_ERR_MAXTEMP_CHAMBER             = _UxGT("錯誤：最高機箱溫度");   //"Err: MAXTEMP CHAMBER"
-  PROGMEM Language_Str MSG_ERR_MINTEMP_CHAMBER             = _UxGT("錯誤：最低機箱溫度");   //"Err: MINTEMP CHAMBER"
   PROGMEM Language_Str MSG_HALTED                          = _UxGT("印表機停機");     //"PRINTER HALTED"
   PROGMEM Language_Str MSG_PLEASE_RESET                    = _UxGT("請重置");     //"Please reset"
   PROGMEM Language_Str MSG_SHORT_DAY                       = _UxGT("天");     //"d" // One character only

Marlin/src/lcd/menu/menu.cpp

   #include "../../libs/buzzer.h"
 #endif
 
-#if WATCH_HOTENDS || WATCH_BED
-  #include "../../module/temperature.h"
-#endif
-
 #if ENABLED(BABYSTEP_ZPROBE_OFFSET)
   #include "../../module/probe.h"
 #endif

Marlin/src/module/temperature.cpp

   hotend_watch_t Temperature::watch_hotend[HOTENDS]; // = { { 0 } }
 #endif
 #if HEATER_IDLE_HANDLER
-  hotend_idle_t Temperature::hotend_idle[HOTENDS]; // = { { 0 } }
+  Temperature::heater_idle_t Temperature::heater_idle[NR_HEATER_IDLE]; // = { { 0 } }
 #endif
 
 #if HAS_HEATED_BED
   #endif
   TERN_(WATCH_BED, bed_watch_t Temperature::watch_bed); // = { 0 }
   TERN(PIDTEMPBED,, millis_t Temperature::next_bed_check_ms);
-  TERN_(HEATER_IDLE_HANDLER, hotend_idle_t Temperature::bed_idle); // = { 0 }
 #endif // HAS_HEATED_BED
 
 #if HAS_TEMP_CHAMBER
 
         if (temp_hotend[ee].target == 0
           || pid_error < -(PID_FUNCTIONAL_RANGE)
-          || TERN0(HEATER_IDLE_HANDLER, hotend_idle[ee].timed_out)
+          || TERN0(HEATER_IDLE_HANDLER, heater_idle[ee].timed_out)
         ) {
           pid_output = 0;
           pid_reset[ee] = true;
 
     #else // No PID enabled
 
-      const bool is_idling = TERN0(HEATER_IDLE_HANDLER, hotend_idle[ee].timed_out);
+      const bool is_idling = TERN0(HEATER_IDLE_HANDLER, heater_idle[ee].timed_out);
       const float pid_output = (!is_idling && temp_hotend[ee].celsius < temp_hotend[ee].target) ? BANG_MAX : 0;
 
     #endif
 
     HOTEND_LOOP() {
       #if ENABLED(THERMAL_PROTECTION_HOTENDS)
-        if (degHotend(e) > temp_range[e].maxtemp)
-          _temp_error((heater_id_t)e, str_t_thermal_runaway, GET_TEXT(MSG_THERMAL_RUNAWAY));
+        if (degHotend(e) > temp_range[e].maxtemp) max_temp_error((heater_id_t)e);
       #endif
 
-      TERN_(HEATER_IDLE_HANDLER, hotend_idle[e].update(ms));
+      TERN_(HEATER_IDLE_HANDLER, heater_idle[e].update(ms));
 
       #if ENABLED(THERMAL_PROTECTION_HOTENDS)
         // Check for thermal runaway
-        thermal_runaway_protection(tr_state_machine[e], temp_hotend[e].celsius, temp_hotend[e].target, (heater_id_t)e, THERMAL_PROTECTION_PERIOD, THERMAL_PROTECTION_HYSTERESIS);
+        tr_state_machine[e].run(temp_hotend[e].celsius, temp_hotend[e].target, (heater_id_t)e, THERMAL_PROTECTION_PERIOD, THERMAL_PROTECTION_HYSTERESIS);
       #endif
 
       temp_hotend[e].soft_pwm_amount = (temp_hotend[e].celsius > temp_range[e].mintemp || is_preheating(e)) && temp_hotend[e].celsius < temp_range[e].maxtemp ? (int)get_pid_output_hotend(e) >> 1 : 0;
   #if HAS_HEATED_BED
 
     #if ENABLED(THERMAL_PROTECTION_BED)
-      if (degBed() > BED_MAXTEMP)
-        _temp_error(H_BED, str_t_thermal_runaway, GET_TEXT(MSG_THERMAL_RUNAWAY));
+      if (degBed() > BED_MAXTEMP) max_temp_error(H_BED);
     #endif
 
     #if WATCH_BED
         TERN_(PAUSE_CHANGE_REQD, last_pause_state = paused);
       #endif
 
-      TERN_(HEATER_IDLE_HANDLER, bed_idle.update(ms));
+      TERN_(HEATER_IDLE_HANDLER, heater_idle[IDLE_INDEX_BED].update(ms));
 
-      TERN_(HAS_THERMALLY_PROTECTED_BED, thermal_runaway_protection(tr_state_machine_bed, temp_bed.celsius, temp_bed.target, H_BED, THERMAL_PROTECTION_BED_PERIOD, THERMAL_PROTECTION_BED_HYSTERESIS));
+      #if HAS_THERMALLY_PROTECTED_BED
+        tr_state_machine[RUNAWAY_IND_BED].run(temp_bed.celsius, temp_bed.target, H_BED, THERMAL_PROTECTION_BED_PERIOD, THERMAL_PROTECTION_BED_HYSTERESIS);
+      #endif
 
       #if HEATER_IDLE_HANDLER
-        if (bed_idle.timed_out) {
+        if (heater_idle[IDLE_INDEX_BED].timed_out) {
           temp_bed.soft_pwm_amount = 0;
           #if DISABLED(PIDTEMPBED)
             WRITE_HEATER_BED(LOW);
     #endif
 
     #if ENABLED(THERMAL_PROTECTION_CHAMBER)
-      if (degChamber() > CHAMBER_MAXTEMP)
-        _temp_error(H_CHAMBER, str_t_thermal_runaway, GET_TEXT(MSG_THERMAL_RUNAWAY));
+      if (degChamber() > CHAMBER_MAXTEMP) max_temp_error(H_CHAMBER);
     #endif
 
     #if WATCH_CHAMBER
         WRITE_HEATER_CHAMBER(LOW);
       }
 
-      TERN_(THERMAL_PROTECTION_CHAMBER, thermal_runaway_protection(tr_state_machine_chamber, temp_chamber.celsius, temp_chamber.target, H_CHAMBER, THERMAL_PROTECTION_CHAMBER_PERIOD, THERMAL_PROTECTION_CHAMBER_HYSTERESIS));
+      #if ENABLED(THERMAL_PROTECTION_CHAMBER)
+        tr_state_machine[RUNAWAY_IND_CHAMBER].run(temp_chamber.celsius, temp_chamber.target, H_CHAMBER, THERMAL_PROTECTION_CHAMBER_PERIOD, THERMAL_PROTECTION_CHAMBER_HYSTERESIS);
+      #endif
     }
 
     // TODO: Implement true PID pwm
 
 #if HAS_THERMAL_PROTECTION
 
-  #if ENABLED(THERMAL_PROTECTION_HOTENDS)
-    Temperature::tr_state_machine_t Temperature::tr_state_machine[HOTENDS]; // = { { TRInactive, 0 } };
-  #endif
-  #if HAS_THERMALLY_PROTECTED_BED
-    Temperature::tr_state_machine_t Temperature::tr_state_machine_bed; // = { TRInactive, 0 };
-  #endif
-  #if ENABLED(THERMAL_PROTECTION_CHAMBER)
-    Temperature::tr_state_machine_t Temperature::tr_state_machine_chamber; // = { TRInactive, 0 };
-  #endif
+  Temperature::tr_state_machine_t Temperature::tr_state_machine[NR_HEATER_RUNAWAY]; // = { { TRInactive, 0 } };
 
-  void Temperature::thermal_runaway_protection(Temperature::tr_state_machine_t &sm, const float &current, const float &target, const heater_id_t heater_id, const uint16_t period_seconds, const uint16_t hysteresis_degc) {
+  /**
+   * @brief Thermal Runaway state machine for a single heater
+   * @param current          current measured temperature
+   * @param target           current target temperature
+   * @param heater_id        extruder index
+   * @param period_seconds   missed temperature allowed time
+   * @param hysteresis_degc  allowed distance from target
+   *
+   * TODO: Embed the last 3 parameters during init, if not less optimal
+   */
+  void Temperature::tr_state_machine_t::run(const float &current, const float &target, const heater_id_t heater_id, const uint16_t period_seconds, const uint16_t hysteresis_degc) {
 
-    static float tr_target_temperature[HOTENDS + 1] = { 0.0 };
+    #if HEATER_IDLE_HANDLER
+      // Convert the given heater_id_t to an idle array index
+      const IdleIndex idle_index = idle_index_for_id(heater_id);
+    #endif
 
     /**
       SERIAL_ECHO_START();
       SERIAL_ECHOPGM("Thermal Runaway Running. Heater ID: ");
-      if (heater_id == H_CHAMBER) SERIAL_ECHOPGM("chamber");
-      if (heater_id < 0) SERIAL_ECHOPGM("bed"); else SERIAL_ECHO(heater_id);
-      SERIAL_ECHOPAIR(" ;  State:", sm.state, " ;  Timer:", sm.timer, " ;  Temperature:", current, " ;  Target Temp:", target);
-      if (heater_id >= 0)
-        SERIAL_ECHOPAIR(" ;  Idle Timeout:", hotend_idle[heater_id].timed_out);
-      else
-        SERIAL_ECHOPAIR(" ;  Idle Timeout:", bed_idle.timed_out);
-      SERIAL_EOL();
+      switch (heater_id) {
+        case H_BED:     SERIAL_ECHOPGM("bed"); break;
+        case H_CHAMBER: SERIAL_ECHOPGM("chamber"); break;
+        default:        SERIAL_ECHO(heater_id);
+      }
+      SERIAL_ECHOLNPAIR(
+        " ; sizeof(running_temp):", sizeof(running_temp),
+        " ;  State:", state, " ;  Timer:", timer, " ;  Temperature:", current, " ;  Target Temp:", target
+        #if HEATER_IDLE_HANDLER
+          , " ;  Idle Timeout:", heater_idle[idle_index].timed_out
+        #endif
+      );
     //*/
 
-    const int heater_index = heater_id >= 0 ? heater_id : HOTENDS;
-
     #if HEATER_IDLE_HANDLER
       // If the heater idle timeout expires, restart
-      if ((heater_id >= 0 && hotend_idle[heater_id].timed_out)
-        || TERN0(HAS_HEATED_BED, (heater_id < 0 && bed_idle.timed_out))
-      ) {
-        sm.state = TRInactive;
-        tr_target_temperature[heater_index] = 0;
+      if (heater_idle[idle_index].timed_out) {
+        state = TRInactive;
+        running_temp = 0;
       }
       else
     #endif
     {
       // If the target temperature changes, restart
-      if (tr_target_temperature[heater_index] != target) {
-        tr_target_temperature[heater_index] = target;
-        sm.state = target > 0 ? TRFirstHeating : TRInactive;
+      if (running_temp != target) {
+        running_temp = target;
+        state = target > 0 ? TRFirstHeating : TRInactive;
       }
     }
 
-    switch (sm.state) {
+    switch (state) {
       // Inactive state waits for a target temperature to be set
       case TRInactive: break;
 
       // When first heating, wait for the temperature to be reached then go to Stable state
       case TRFirstHeating:
-        if (current < tr_target_temperature[heater_index]) break;
-        sm.state = TRStable;
+        if (current < running_temp) break;
+        state = TRStable;
 
       // While the temperature is stable watch for a bad temperature
       case TRStable:
         #if ENABLED(ADAPTIVE_FAN_SLOWING)
           if (adaptive_fan_slowing && heater_id >= 0) {
             const int fan_index = _MIN(heater_id, FAN_COUNT - 1);
-            if (fan_speed[fan_index] == 0 || current >= tr_target_temperature[heater_id] - (hysteresis_degc * 0.25f))
+            if (fan_speed[fan_index] == 0 || current >= running_temp - (hysteresis_degc * 0.25f))
               fan_speed_scaler[fan_index] = 128;
-            else if (current >= tr_target_temperature[heater_id] - (hysteresis_degc * 0.3335f))
+            else if (current >= running_temp - (hysteresis_degc * 0.3335f))
               fan_speed_scaler[fan_index] = 96;
-            else if (current >= tr_target_temperature[heater_id] - (hysteresis_degc * 0.5f))
+            else if (current >= running_temp - (hysteresis_degc * 0.5f))
               fan_speed_scaler[fan_index] = 64;
-            else if (current >= tr_target_temperature[heater_id] - (hysteresis_degc * 0.8f))
+            else if (current >= running_temp - (hysteresis_degc * 0.8f))
               fan_speed_scaler[fan_index] = 32;
             else
               fan_speed_scaler[fan_index] = 0;
           }
         #endif
 
-        if (current >= tr_target_temperature[heater_index] - hysteresis_degc) {
-          sm.timer = millis() + SEC_TO_MS(period_seconds);
+        if (current >= running_temp - hysteresis_degc) {
+          timer = millis() + SEC_TO_MS(period_seconds);
           break;
         }
-        else if (PENDING(millis(), sm.timer)) break;
-        sm.state = TRRunaway;
+        else if (PENDING(millis(), timer)) break;
+        state = TRRunaway;
 
       case TRRunaway:
         TERN_(DWIN_CREALITY_LCD, Popup_Window_Temperature(0));
     if (p != paused) {
       paused = p;
       if (p) {
-        HOTEND_LOOP() hotend_idle[e].expire();    // Timeout immediately
-        TERN_(HAS_HEATED_BED, bed_idle.expire()); // Timeout immediately
+        HOTEND_LOOP() heater_idle[e].expire();    // Timeout immediately
+        TERN_(HAS_HEATED_BED, heater_idle[IDLE_INDEX_BED].expire()); // Timeout immediately
       }
       else {
         HOTEND_LOOP() reset_hotend_idle_timer(e);
     #else
       #define BEDCMP(A,B) ((A)>(B))
     #endif
-    const bool bed_on = temp_bed.target > 0
-      || TERN0(PIDTEMPBED, temp_bed.soft_pwm_amount) > 0
-    ;
+    const bool bed_on = (temp_bed.target > 0) || TERN0(PIDTEMPBED, temp_bed.soft_pwm_amount > 0);
     if (BEDCMP(temp_bed.raw, maxtemp_raw_BED)) max_temp_error(H_BED);
     if (bed_on && BEDCMP(mintemp_raw_BED, temp_bed.raw)) min_temp_error(H_BED);
   #endif

Marlin/src/module/temperature.h

 #define HOTEND_INDEX TERN(HAS_MULTI_HOTEND, e, 0)
 #define E_NAME TERN_(HAS_MULTI_HOTEND, e)
 
-// Identifiers for other heaters
+// Heater identifiers. Positive values are hotends. Negative values are other heaters.
 typedef enum : int8_t {
   INDEX_NONE = -5,
   H_PROBE, H_REDUNDANT, H_CHAMBER, H_BED,
   typedef temp_info_t chamber_info_t;
 #endif
 
-// Heater idle handling
-typedef struct {
-  millis_t timeout_ms;
-  bool timed_out;
-  inline void update(const millis_t &ms) { if (!timed_out && timeout_ms && ELAPSED(ms, timeout_ms)) timed_out = true; }
-  inline void start(const millis_t &ms) { timeout_ms = millis() + ms; timed_out = false; }
-  inline void reset() { timeout_ms = 0; timed_out = false; }
-  inline void expire() { start(0); }
-} hotend_idle_t;
-
 // Heater watch handling
 template <int INCREASE, int HYSTERESIS, millis_t PERIOD>
 struct HeaterWatch {
     FORCE_INLINE static bool targetHotEnoughToExtrude(const uint8_t e) { return !targetTooColdToExtrude(e); }
 
     #if HEATER_IDLE_HANDLER
-      static hotend_idle_t hotend_idle[HOTENDS];
-      TERN_(HAS_HEATED_BED, static hotend_idle_t bed_idle);
-      TERN_(HAS_HEATED_CHAMBER, static hotend_idle_t chamber_idle);
+
+      // Heater idle handling. Marlin creates one per hotend and one for the heated bed.
+      typedef struct {
+        millis_t timeout_ms;
+        bool timed_out;
+        inline void update(const millis_t &ms) { if (!timed_out && timeout_ms && ELAPSED(ms, timeout_ms)) timed_out = true; }
+        inline void start(const millis_t &ms) { timeout_ms = millis() + ms; timed_out = false; }
+        inline void reset() { timeout_ms = 0; timed_out = false; }
+        inline void expire() { start(0); }
+      } heater_idle_t;
+
+      // Indices and size for the heater_idle array
+      #define _ENUM_FOR_E(N) IDLE_INDEX_E##N,
+      enum IdleIndex : uint8_t {
+        REPEAT(HOTENDS, _ENUM_FOR_E)
+        #if ENABLED(HAS_HEATED_BED)
+          IDLE_INDEX_BED,
+        #endif
+        NR_HEATER_IDLE
+      };
+      #undef _ENUM_FOR_E
+
+      // Convert the given heater_id_t to idle array index
+      static inline IdleIndex idle_index_for_id(const int8_t heater_id) {
+        #if HAS_HEATED_BED
+          if (heater_id == H_BED) return IDLE_INDEX_BED;
+        #endif
+        return (IdleIndex)_MAX(heater_id, 0);
+      }
+
+      static heater_idle_t heater_idle[NR_HEATER_IDLE];
+
     #endif
 
   private:
     #if HEATER_IDLE_HANDLER
 
       static void reset_hotend_idle_timer(const uint8_t E_NAME) {
-        hotend_idle[HOTEND_INDEX].reset();
+        heater_idle[HOTEND_INDEX].reset();
         start_watching_hotend(HOTEND_INDEX);
       }
 
       #if HAS_HEATED_BED
         static void reset_bed_idle_timer() {
-          bed_idle.reset();
+          heater_idle[IDLE_INDEX_BED].reset();
           start_watching_bed();
         }
       #endif
     static void min_temp_error(const heater_id_t e);
     static void max_temp_error(const heater_id_t e);
 
-    #define HAS_THERMAL_PROTECTION (EITHER(THERMAL_PROTECTION_HOTENDS, THERMAL_PROTECTION_CHAMBER) || HAS_THERMALLY_PROTECTED_BED)
+    #define HAS_THERMAL_PROTECTION ANY(THERMAL_PROTECTION_HOTENDS, THERMAL_PROTECTION_CHAMBER, HAS_THERMALLY_PROTECTED_BED)
 
     #if HAS_THERMAL_PROTECTION
 
+      // Indices and size for the tr_state_machine array. One for each protected heater.
+      #define _ENUM_FOR_E(N) RUNAWAY_IND_E##N,
+      enum RunawayIndex : uint8_t {
+        #if ENABLED(THERMAL_PROTECTION_HOTENDS)
+          REPEAT(HOTENDS, _ENUM_FOR_E)
+        #endif
+        #if ENABLED(HAS_THERMALLY_PROTECTED_BED)
+          RUNAWAY_IND_BED,
+        #endif
+        #if ENABLED(THERMAL_PROTECTION_CHAMBER)
+          RUNAWAY_IND_CHAMBER,
+        #endif
+        NR_HEATER_RUNAWAY
+      };
+      #undef _ENUM_FOR_E
+
+      // Convert the given heater_id_t to runaway state array index
+      static inline RunawayIndex runaway_index_for_id(const int8_t heater_id) {
+        #if HAS_THERMALLY_PROTECTED_CHAMBER
+          if (heater_id == H_CHAMBER) return RUNAWAY_IND_CHAMBER;
+        #endif
+        #if HAS_THERMALLY_PROTECTED_BED
+          if (heater_id == H_BED) return RUNAWAY_IND_BED;
+        #endif
+        return (RunawayIndex)_MAX(heater_id, 0);
+      }
+
       enum TRState : char { TRInactive, TRFirstHeating, TRStable, TRRunaway };
 
       typedef struct {
         millis_t timer = 0;
         TRState state = TRInactive;
+        float running_temp;
+        void run(const float &current, const float &target, const heater_id_t heater_id, const uint16_t period_seconds, const uint16_t hysteresis_degc);
       } tr_state_machine_t;
 
-      TERN_(THERMAL_PROTECTION_HOTENDS, static tr_state_machine_t tr_state_machine[HOTENDS]);
-      TERN_(HAS_THERMALLY_PROTECTED_BED, static tr_state_machine_t tr_state_machine_bed);
-      TERN_(THERMAL_PROTECTION_CHAMBER, static tr_state_machine_t tr_state_machine_chamber);
-
-      static void thermal_runaway_protection(tr_state_machine_t &state, const float &current, const float &target, const heater_id_t heater_id, const uint16_t period_seconds, const uint16_t hysteresis_degc);
+      static tr_state_machine_t tr_state_machine[NR_HEATER_RUNAWAY];
 
     #endif // HAS_THERMAL_PROTECTION
 };