I have replaced the sequencer. The heating elements cut when thermostat temperature is reached but the fan never cuts off. It will change speeds if I turn switch from heat to AC. What could cause this?

Usually the sequencer controls the heat emlements and the blower on off cycle on those units. I suggest post your problem here under Coleman. They deal with this unit all the time. You can also buy your manual at this site.

Coleman 3500A Installation Manual Details


Post question here under Coleman


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