Added FAN_PIN -1 checks

Marlin/planner.cpp

@@ -437,13 +437,17 @@ void check_axes_activity() {
     }
   }
   else {
+    #if FAN_PIN > -1
       if (FanSpeed != 0) analogWrite(FAN_PIN,FanSpeed); // If buffer is empty use current fan speed
+    #endif
   }
   if((DISABLE_X) && (x_active == 0)) disable_x();
   if((DISABLE_Y) && (y_active == 0)) disable_y();
   if((DISABLE_Z) && (z_active == 0)) disable_z();
   if((DISABLE_E) && (e_active == 0)) { disable_e0();disable_e1();disable_e2(); }
+  #if FAN_PIN > -1
     if((FanSpeed == 0) && (fan_speed ==0)) analogWrite(FAN_PIN, 0);
+  #endif
   if (FanSpeed != 0 && tail_fan_speed !=0) { 
     analogWrite(FAN_PIN,tail_fan_speed);
   }

Marlin/ultralcd.pde

@@ -505,10 +505,18 @@ void MainMenu::showPrepare()
       MENUITEM(  lcdprintPGM(MSG_SET_ORIGIN)  ,  BLOCK;enquecommand("G92 X0 Y0 Z0");beepshort(); ) ;
       break;
     case ItemP_preheat_pla:
-      MENUITEM(  lcdprintPGM(MSG_PREHEAT_PLA)  ,  BLOCK;setTargetHotend0(PLA_PREHEAT_HOTEND_TEMP);setTargetBed(PLA_PREHEAT_HPB_TEMP);analogWrite(FAN_PIN, PLA_PREHEAT_FAN_SPEED); beepshort(); ) ;
+      MENUITEM(  lcdprintPGM(MSG_PREHEAT_PLA)  ,  BLOCK;setTargetHotend0(PLA_PREHEAT_HOTEND_TEMP);setTargetBed(PLA_PREHEAT_HPB_TEMP);
+      #if FAN_PIN > -1
+        analogWrite(FAN_PIN, PLA_PREHEAT_FAN_SPEED);
+      #endif
+      beepshort(); );
       break;
     case ItemP_preheat_abs:
-      MENUITEM(  lcdprintPGM(MSG_PREHEAT_ABS)  ,  BLOCK;setTargetHotend0(ABS_PREHEAT_HOTEND_TEMP);setTargetBed(ABS_PREHEAT_HPB_TEMP); analogWrite(FAN_PIN, ABS_PREHEAT_FAN_SPEED); beepshort(); ) ;
+      MENUITEM(  lcdprintPGM(MSG_PREHEAT_ABS)  ,  BLOCK;setTargetHotend0(ABS_PREHEAT_HOTEND_TEMP);setTargetBed(ABS_PREHEAT_HPB_TEMP); 
+      #if FAN_PIN > -1
+        analogWrite(FAN_PIN, ABS_PREHEAT_FAN_SPEED);
+      #endif
+      beepshort(); );
       break;
     case ItemP_cooldown:
       MENUITEM(  lcdprintPGM(MSG_COOLDOWN)  ,  BLOCK;setTargetHotend0(0);setTargetBed(0);beepshort(); ) ;