RV Repair: Duo Therm Heat Pump for RV, holiday rambler vacationer, copper lines

Question
Bill  I have a 2002 Holiday Rambler Vacationer with 2 roof heat pumps  The front unit on cool tripped the 20amp breaker last weekend and after resetting breaker I only have the heat cycle and no cold  The model #630035.321 and serial#217 32397  Hope you can help Thanks Dave

Answer
Dave, It sounds to me like the reversing valve went out. If not then it has lost power to it for some reason, like shorting somewhere. Open up the top of the unit and you will see the valve. It will be near the compressor and hooked to the copper lines with a plug wire going to it. Thanks, Bill