diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index a2e7e7994577dd17de46fa123890a9c3c582ac3e..62e84b1fda6a4fc753c476f17019cd17082d7186 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -154,7 +154,7 @@ void PID_autotune(float temp)
   
   SERIAL_ECHOLN("PID Autotune start");
   
-  disable_heater(); // switch off all heaters.
+  //disable_heater(); // switch off all heaters.
   
   for(;;) {