Fix for HEATERS_PARALLEL

Marlin/temperature.cpp

@@ -1286,9 +1286,7 @@ void Temperature::disable_all_heaters() {
   }
 
   #if HAS_TEMP_HOTEND
-    setTargetHotend(0, 0);
+    DISABLE_HEATER(0);
-    soft_pwm[0] = 0;
-    WRITE_HEATER_0P(LOW); // Should HEATERS_PARALLEL apply here? Then change to DISABLE_HEATER(0)
   #endif
 
   #if HOTENDS > 1 && HAS_TEMP_1
@@ -1431,7 +1429,7 @@ void Temperature::isr() {
 
   // Statics per heater
   ISR_STATICS(0);
-  #if (HOTENDS > 1) || ENABLED(HEATERS_PARALLEL)
+  #if HOTENDS > 1
     ISR_STATICS(1);
     #if HOTENDS > 2
       ISR_STATICS(2);
@@ -1450,15 +1448,11 @@ void Temperature::isr() {
 
   #if DISABLED(SLOW_PWM_HEATERS)
     /**
-     * standard PWM modulation
+     * Standard PWM modulation
      */
     if (pwm_count == 0) {
       soft_pwm_0 = soft_pwm[0];
-      if (soft_pwm_0 > 0) {
+      WRITE_HEATER_0(soft_pwm_0 > 0 ? 1 : 0);
-        WRITE_HEATER_0(1);
-      }
-      else WRITE_HEATER_0P(0); // If HEATERS_PARALLEL should apply, change to WRITE_HEATER_0
-
       #if HOTENDS > 1
         soft_pwm_1 = soft_pwm[1];
         WRITE_HEATER_1(soft_pwm_1 > 0 ? 1 : 0);
@@ -1535,7 +1529,7 @@ void Temperature::isr() {
       #define MIN_STATE_TIME 16 // MIN_STATE_TIME * 65.5 = time in milliseconds
     #endif
 
-    // Macros for Slow PWM timer logic - HEATERS_PARALLEL applies
+    // Macros for Slow PWM timer logic
     #define _SLOW_PWM_ROUTINE(NR, src) \
       soft_pwm_ ## NR = src; \
       if (soft_pwm_ ## NR > 0) { \