Index: leahi_dialin/dd/modules/heaters.py
===================================================================
diff -u -rec875ed5c87bc2896ca162774ff4ad449b0a88a3 -r951bd79131f9c5dd0e62d40a2101815100cdb787
--- leahi_dialin/dd/modules/heaters.py	(.../heaters.py)	(revision ec875ed5c87bc2896ca162774ff4ad449b0a88a3)
+++ leahi_dialin/dd/modules/heaters.py	(.../heaters.py)	(revision 951bd79131f9c5dd0e62d40a2101815100cdb787)
@@ -261,4 +261,34 @@
             return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
         else:
             self.logger.debug("Timeout!!!!")
+            return False
+
+
+    def cmd_heater_pwm_period_override(self, heater: int, period: float, reset: int) -> int:
+        """
+        Constructs and sends heater pwm period override
+
+        @param heater the heater to override its value (primary, trimmer) (0-1.0 order)
+        @param period: float - period to set to
+        @param reset: (int) 1 to reset a previous override, 0 to override
+        @returns 1 if successful, zero otherwise
+        """
+        htr = integer_to_bytearray(heater)
+        prd = float_to_bytearray(period)
+        rst = integer_to_bytearray(reset)
+        payload = rst + prd + htr
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dd_ch_id,
+                                              message_id=MsgIds.MSG_ID_DD_HEATERS_PWM_PERIOD_OVERRIDE_REQUEST.value,
+                                              payload=payload)
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is content in message
+        if received_message is not None:
+            # Response payload is OK or not
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.debug("Timeout!!!!")
             return False
\ No newline at end of file