1. Disconnect the unit from the power source, remove the evaporator cover, and remove the wires from the two heater terminals.
2. Follow steps 1, 2, and 3 in the “A Quick Termination Thermostat Check (Using the Bypass Method).”
3. Connect the two alligator clips on the test light to the two heater wires. Make sure the connections are well insulated and do not touch anything else.
4. Reconnect power to the unit and turn the timer shaft clockwise with a screwdriver until you hear a click. At this point, the compressor stops working.
5. If the test light glows, disconnect power to the unit and reconnect the heater wires to the heater terminals.
6. Connect power to the unit. If the heater begins heating, check the termination thermostat and the timer, and replace the defective part. If the heater doesn’t heat, replace the heater.
