heat pump defrost cycle


Old 10-17-01, 01:45 PM
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OK-I have a Comfortmaker Heat Pump (don't know model #) and it's 12 years old & been a good one!!!!!! Now it's learned a new trick--it won't go into the defrost cycle to thaw the outside unit coils. Any suggestions?
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Old 10-17-01, 10:18 PM
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Wait until

it frosts up again.Turn tstat so it does not call for heat.5 minutes later turn a/c on.If the coil defrosts and you get cooling that means the reversing valve is okay.With out a wiring diagram to look at it's hard to say.Your defrost cycle might be a time/temp setup or it could be a pressure differential setup.Hang in there for other "TECHS" to assist.PDF

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