Auxillary heat does not come on during defrost cycle.

by Jeff Harvey
(Greer,SC)

Lennox
12CHP048-3P

Unit blows ice cold air during defrost cycle causing temperature in conditioned space to drop 5 to 10 degrees f

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Dec 09, 2013
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by: Anonymous

It is most likely a bad defrost board or bad defrost/auxiliary heat control relays. Or possibly the auxiliary heater has some problems. For example there could be an open heater element or the high limit on the heater could be open or bad.

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