Question about Heating & Cooling
If the flue is warm that would indicate that the flames lit for a short while. furnaces sometimes have limit switches that shut down the gas if the heat exchanger gets too hot. I would verify you have clean filters. and all registars open fully.
If the flames are not lighting verify gas valve is recieving the 24vlts. to open.
Also check ignition system it will be a piolet light or hot surface ignitor. you should be able to see both without much trouble. hs ignitor should get bright cherry red.
Posted on Sep 24, 2008
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Posted on Jan 02, 2017
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The automatic defrost system has 3 parts. 1: Timer. 2: heater. 3: thermal switch
The timer will start the automatic defrost cycle every so many hours. If the timer fails, the defrost cycle will never start. The electrical schematics should be under or on the back of the refrigerator. You can use this to figure out how to test the timer.
The heater is what does the actual defrosting. If it is broken, it will not heat.
The thermal switch turns the heater off when enough ice has been melted. If this switch fails, it will prevent the heater from heating.
The heater and the thermal switch will be wired in series and their connections will be securely covered so you cannot test them independently. You can electrically test then together but you cannot decide which one is broken unless you expose or cut a wire. I have never seen a heater fail.
I see timers and thermal switches fail. Heaters don't fail very often.
The heater and thermal switch are in the freezer area and are very close to the evaporator. You will have to take apart enough of the freezer compartment to get to these parts. You will also need to melt enough ice to get to these parts.
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