diff --git a/klippy/extras/verify_heater.py b/klippy/extras/verify_heater.py
index 41ef2613..ba7add6c 100644
--- a/klippy/extras/verify_heater.py
+++ b/klippy/extras/verify_heater.py
@@ -28,6 +28,9 @@ class HeaterCheck:
         self.fault_systime = self.printer.get_reactor().NEVER
     def printer_state(self, state):
         if state == 'connect':
+            if self.printer.get_start_args().get('debugoutput') is not None:
+                # Disable verify_heater if outputting to a debug file
+                return
             pheater = self.printer.lookup_object('heater')
             self.heater = pheater.lookup_heater(self.heater_name)
             logging.info("Starting heater checks for %s", self.heater_name)