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moundtown 01-24-2013 08:02 AM

Intertherm electric furnace will not stop running
I have an old Intertherm electric furnace model: MAC 2454A. It will not stop running. Two years ago the heating element would turn off but the fan kept running at which time I installed a new sequencer and that fixed the problem. Now neither the heater element nor the fan will stop running. I have disconnected the thermostat which made no difference. Any ideas to what might be causing this?


Doc Holliday 01-24-2013 04:53 PM

fan relay/contactor is stuck.

beenthere 01-24-2013 05:09 PM

Sequencer stuck closed.

blingbling 01-24-2013 05:27 PM

Sequencer is stuck closed.

moundtown 01-24-2013 05:56 PM

Thanks all. Diagnosis seems to be unanimous, and as it turns out, correct as well. I removed the sequencer that I had installed just the winter before last and it tested bad. Replaced it with a new one and the problem is solved.

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