[2.0.x] Fix_Autotune_THERMAL_PROTECTION_BED_off (#10166)

- Fix Autotune Thermal Protection
- Make 2 constants in autotune configurable

Marlin/src/module/temperature.cpp

@@ -409,7 +409,9 @@ uint8_t Temperature::soft_pwm_amount[HOTENDS],
       }
 
       // Did the temperature overshoot very far?
+      #ifndef MAX_OVERSHOOT_PID_AUTOTUNE
         #define MAX_OVERSHOOT_PID_AUTOTUNE 20
+      #endif
       if (current > target + MAX_OVERSHOOT_PID_AUTOTUNE) {
         SERIAL_PROTOCOLLNPGM(MSG_PID_TEMP_TOO_HIGH);
         break;
@@ -425,6 +427,15 @@ uint8_t Temperature::soft_pwm_amount[HOTENDS],
 
         // Make sure heating is actually working
         #if WATCH_THE_BED || WATCH_HOTENDS
+          if (
+            #if WATCH_THE_BED && WATCH_HOTENDS
+              true
+            #elif WATCH_THE_BED
+              hotend < 0
+            #else
+              hotend >= 0
+            #endif
+          ) {
             if (!heated) {                                          // If not yet reached target...
               if (current > next_watch_temp) {                      // Over the watch temp?
                 next_watch_temp = current + watch_temp_increase;    // - set the next temp to watch for
@@ -438,11 +449,15 @@ uint8_t Temperature::soft_pwm_amount[HOTENDS],
               _temp_error(hotend, PSTR(MSG_T_THERMAL_RUNAWAY),
                 hotend >= 0 ? PSTR(MSG_THERMAL_RUNAWAY) : PSTR(MSG_THERMAL_RUNAWAY_BED)
               );
+          }
         #endif
       } // every 2 seconds
 
-      // Timeout after 20 minutes since the last undershoot/overshoot cycle
-      if (((ms - t1) + (ms - t2)) > (20L * 60L * 1000L)) {
+      // Timeout after MAX_CYCLE_TIME_PID_AUTOTUNE minutes since the last undershoot/overshoot cycle
+      #ifndef MAX_CYCLE_TIME_PID_AUTOTUNE
+        #define MAX_CYCLE_TIME_PID_AUTOTUNE 20L
+      #endif
+      if (((ms - t1) + (ms - t2)) > (MAX_CYCLE_TIME_PID_AUTOTUNE * 60L * 1000L)) {
         SERIAL_PROTOCOLLNPGM(MSG_PID_TIMEOUT);
         break;
       }