Allow non-zero "fan off" PWM value (#15709)

Marlin/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

Marlin/src/inc/Conditionals_post.h

 /**
  * MIN/MAX fan PWM scaling
  */
+#ifndef FAN_OFF_PWM
+  #define FAN_OFF_PWM 0
+#endif
 #ifndef FAN_MIN_PWM
-  #define FAN_MIN_PWM 0
+  #if FAN_OFF_PWM > 0
+    #define FAN_MIN_PWM (FAN_OFF_PWM + 1)
+  #else
+    #define FAN_MIN_PWM 0
+  #endif
 #endif
 #ifndef FAN_MAX_PWM
   #define FAN_MAX_PWM 255
   #error "FAN_MAX_PWM must be a value from 0 to 255."
 #elif FAN_MIN_PWM > FAN_MAX_PWM
   #error "FAN_MIN_PWM must be less than or equal to FAN_MAX_PWM."
+#elif FAN_OFF_PWM > FAN_MIN_PWM
+  #error "FAN_OFF_PWM must be less than or equal to FAN_MIN_PWM."
 #endif
 
 /**

Marlin/src/module/planner.cpp

     #endif
 
     #if FAN_MIN_PWM != 0 || FAN_MAX_PWM != 255
-      #define CALC_FAN_SPEED(f) (tail_fan_speed[f] ? map(tail_fan_speed[f], 1, 255, FAN_MIN_PWM, FAN_MAX_PWM) : 0)
+      #define CALC_FAN_SPEED(f) (tail_fan_speed[f] ? map(tail_fan_speed[f], 1, 255, FAN_MIN_PWM, FAN_MAX_PWM) : FAN_OFF_PWM)
     #else
-      #define CALC_FAN_SPEED(f) tail_fan_speed[f]
+      #define CALC_FAN_SPEED(f) (tail_fan_speed[f] ?: FAN_OFF_PWM)
     #endif
 
     #if ENABLED(FAN_SOFT_PWM)

config/default/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/3DFabXYZ/Migbot/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/ADIMLab/Gantry v1/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/ADIMLab/Gantry v2/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/AlephObjects/TAZ4/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Alfawise/U20-bltouch/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Alfawise/U20/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/AliExpress/UM2pExt/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 #define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Anet/A2/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Anet/A2plus/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Anet/A6/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Anet/A8/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Anet/A8plus/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Anet/E16/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/AnyCubic/i3/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/ArmEd/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/BIBO/TouchX/cyclops/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/BIBO/TouchX/default/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/BQ/Hephestos/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/BQ/Hephestos_2/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 #define FAN_KICKSTART_TIME 800
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/BQ/WITBOX/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Cartesio/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/CR-10/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/CR-10S/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/CR-10_5S/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/CR-10mini/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/CR-20 Pro/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/CR-20/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/CR-8/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/Ender-2/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/Ender-3/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/Ender-4/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Creality/Ender-5/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Dagoma/Disco Ultimate/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 #define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/EVNOVO (Artillery)/Sidewinder X1/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Einstart-S/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/FYSETC/AIO_II/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/FYSETC/Cheetah 1.2/BLTouch/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/FYSETC/Cheetah 1.2/base/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/FYSETC/Cheetah/BLTouch/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/FYSETC/Cheetah/base/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/FYSETC/F6_13/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Felix/DUAL/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Felix/Single/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/FlashForge/CreatorPro/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/FolgerTech/i3-2020/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Formbot/Raptor/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 #define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Formbot/T_Rex_2+/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 #define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Formbot/T_Rex_3/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 #define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Geeetech/A10/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Geeetech/A10M/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Geeetech/A20M/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Geeetech/MeCreator2/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Geeetech/Prusa i3 Pro C/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Geeetech/Prusa i3 Pro W/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/HMS434/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/Infitary/i3-M508/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/JGAurora/A1/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/JGAurora/A5/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/JGAurora/A5S/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/Anycubic/Kossel/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/Dreammaker/Overlord/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 #define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/Dreammaker/Overlord_Pro/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 #define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/FLSUN/auto_calibrate/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/FLSUN/kossel/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/FLSUN/kossel_mini/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/Geeetech/Rostock 301/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/MKS/SBASE/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/Tevo Little Monster/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/generic/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/kossel_mini/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/delta/kossel_xl/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *

config/examples/gCreate/gMax1.5+/Configuration_adv.h

 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Some coolers may require a non-zero "off" state.
+//#define FAN_OFF_PWM  1
+
 /**
  * PWM Fan Scaling
  *