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Old 09-23-2016, 06:49 PM   #1
Join Date: Dec 2011
Location: Parsonsfield Maine
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Rooftop AC/Heat pump

My AC/heat pump puts out heat in either cooling or heat pump setting, is the problem in the duo therm controller or the AC unit ?

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Old 09-23-2016, 06:57 PM   #2
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Without performing some diagnostics, any answer you receive one way or the other is nothing more than a guess.

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Old 09-23-2016, 07:07 PM   #3
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Is it a Penguin? The original Penguins default to heat mode and the coil that operates the reversing valve have been known to fail.

It would definitely help if you had the model number of the unit, you can usually find it by taking the top cover off.
Stewart, Brenda and kids
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Old 09-23-2016, 07:15 PM   #4
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X2 on reversing valve.

I had a problem like this ~4 years ago. The AC was working fine, we moved to a different site and it defaulted to heat mode.

Went on the roof to check and found that the the wires going to the reversing valve had contacted the copper tubing and melted going to ground. Fixed the wires and tested the AC and it put on cold air. Did a better job securing the wires so they wouldn't touch the tubing.
Jim J
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Old 09-23-2016, 08:19 PM   #5
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Originally Posted by toolster View Post
My AC/heat pump puts out heat in either cooling or heat pump setting, is the problem in the duo therm controller or the AC unit ?
x3 on the reversing valve.
I had the same problem and changed out the solenoid. Mine looks similar to the solenoid on a irrigation valve you may have in your yard. Very easy to change if you're okay getting on the roof.
bill h
06 Windsor PRQ, ISL
2014 Honda CRV
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Old 09-28-2016, 05:04 PM   #6
Join Date: Dec 2011
Location: Parsonsfield Maine
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Thanks guys for your help on this. When i got home after my trip the AC worked normally again, so maybe it had something to do with the shore power at the campsite !!

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heat, heat pump, roof

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