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Duo therm roof air is stuck in the heat pump mode, it won,t cool

This is a 1999 diesel pusher with two a/c units on it. The owner plugged the shore power into a 2 or 3 phase power supply. Now the front unit will only work in the heat pump mode. Even when it is set on a/c. The rear unit works off of the same thermostat and it works fine.

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The heat pump has a reversing valve that MUST have power to it (to open it) so that your unit will cool My guess is that the reversing solenoid is bad (its is magnet). They aren't easy to get but not hard to replace. It could also be the control circuit board or a relay. No matter what is causing it, the problem is that your reversing valve is not getting power so that it can open and allow your unit to cool rather than heat.

Posted on May 20, 2010

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The control circuit board that controls the contactor for that unit is proboly damaged
If it is a heat pump. And not electric heat

Or the Yellow wire from the thermostat going to the unit that wont work in thecooling mode is broken,burned,or loose

Posted on May 26, 2009

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