Originally Posted by argosy20
John, another forum member, I belive it was Porky Pig, had a PC board problem with his unit. IIRC, his wouldn't operate in heat pump mode. It was replaced, and he has not reported any further problems.
For anyone who encounters this problem, the probable cause (and what happened to mine) is a jammed reversal valve. The valve swaps the functions of the inside and outside of the AC to make it a heat pump.
The tech pulled off the wire from the reversal valve and it still blew hot. That showed that it was not the circuit board. Unfortunately, the only economical solution is to replace the entire unit since the valve would have to be unsoldered, a new valve soldered in, and the unit recharged.
The new unit should arrive tomorrow and I should have the trailer back Wednesday. My wife is headed to Greece Wednesday for 10 days and I'm headed out to some state parks.