Lennox Error Code 65543

Priority condition: Information Only-Dealer • When new firmware has been successfully updated to the thermostat. • Typically the thermostat will send a command to the unknown device and place it in a soft disable state. The Lennox communicating control with the soft disable state will indicate so as follows: • On air handler, furnace and outdoor controls, the state is displayed by double horizontal lines on seven-segment display. • On the damper control module, the green LED will flash 3 seconds on and 1 second off. • On the equipment interface module, the green LED will flash 3 seconds on and 1 second off. Cycling power to the soft disabled control may clear the condition. If cycling power does not clear the soft disable state then replace control.