diff --git a/klippy/extras/heaters.py b/klippy/extras/heaters.py
index 707d715..08cabda 100644
--- a/klippy/extras/heaters.py
+++ b/klippy/extras/heaters.py
@@ -85,6 +85,16 @@ class Heater:
             adj_time = min(time_diff * self.inv_smooth_time, 1.)
             self.smoothed_temp += temp_diff * adj_time
             self.can_extrude = (self.smoothed_temp >= self.min_extrude_temp)
+
+        toolhead = self.printer.lookup_object("toolhead")
+        curtime = self.printer.get_reactor().monotonic()
+        position_z = toolhead.get_position()[2]
+        if position_z > 270. and "xyz" in toolhead.get_status(curtime)["homed_axes"]:
+            heaters = self.printer.lookup_object("heaters")
+            heater = heaters.lookup_heater("chamber")
+            if heater.target_temp > 0.:
+                heaters.set_temperature(heater, 0.)
+
         #logging.debug("temp: %.3f %f = %f", read_time, temp)
     # External commands
     def get_pwm_delay(self):
@@ -268,6 +278,7 @@ class PrinterHeaters:
         self.sensor_factories[sensor_type] = sensor_factory
     def setup_heater(self, config, gcode_id=None):
         heater_name = config.get_name().split()[-1]
+        logging.info("EEEEEEE %s", heater_name)
         if heater_name in self.heaters:
             raise config.error("Heater %s already registered" % (heater_name,))
         # Setup sensor
diff --git a/klippy/extras/verify_heater.py b/klippy/extras/verify_heater.py
index 6726e47..5f9c86b 100644
--- a/klippy/extras/verify_heater.py
+++ b/klippy/extras/verify_heater.py
@@ -22,6 +22,8 @@ class HeaterCheck:
         self.hysteresis = config.getfloat('hysteresis', 5., minval=0.)
         self.max_error = config.getfloat('max_error', 120., minval=0.)
         self.heating_gain = config.getfloat('heating_gain', 2., above=0.)
+        self.position_z = config.getfloat('position_z', 9999., minval=0.)
+        logging.info("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA %f", self.position_z)
         default_gain_time = 20.
         if self.heater_name == 'heater_bed':
             default_gain_time = 60.
@@ -58,6 +60,7 @@ class HeaterCheck:
             return eventtime + 1.
         self.error += (target - self.hysteresis) - temp
         if not self.approaching_target:
+            logging.info("CCCCC self.error is %f", self.error)
             if target != self.last_target:
                 # Target changed - reset checks
                 logging.info("Heater %s approaching new target of %.3f",
@@ -66,8 +69,14 @@ class HeaterCheck:
                 self.goal_temp = temp + self.heating_gain
                 self.goal_systime = eventtime + self.check_gain_time
             elif self.error >= self.max_error:
-                # Failure due to inability to maintain target temperature
-                return self.heater_fault()
+                toolhead = self.printer.lookup_object('toolhead')
+                position_z = toolhead.get_position()[2]
+                logging.info("CCCCC position_z is %f", position_z)
+                if position_z > self.position_z:
+                    self.error = 0.
+                else:    
+                    # Failure due to inability to maintain target temperature
+                    return self.heater_fault()
         elif temp >= self.goal_temp:
             # Temperature approaching target - reset checks
             self.starting_approach = False