A method of clearing an HVAC control fault code memory is disclosed. The method includes assigning a predetermined reset code to an HVAC control system, the predetermined reset code comprising a plurality of control signals receivable by the HVAC control system, detecting control signals at the HVAC control system, determining whether the detected HVAC control input signals match the predetermined reset code and clearing a fault code memory of the HVAC control system in response to control signals matching the predetermined reset code.