Disable FAST_PWM by default. On some systems it does not work ok.

Marlin/Configuration.h

@@ -279,7 +279,7 @@ const bool Z_ENDSTOPS_INVERTING = true; // set to true to invert the logic of th
 #endif
 
 // Increase the FAN pwm frequency. Removes the PWM noise but increases heating in the FET/Arduino
-#define FAST_PWM_FAN
+//#define FAST_PWM_FAN
 
 // M240  Triggers a camera by emulating a Canon RC-1 Remote
 // Data from: http://www.doc-diy.net/photo/rc-1_hacked/