A/C, heat pump, AquaHot Thermostat

[TX-Max]

Originally Posted by TX-Max

2018 Dynaquest XL, with Dometic low profile A/C w/heat pump. On the thermostat, first, A/C, second, furnace (aquahot), third, heat pump. As of earlier today goes from A/C to furnace (no heat pump) choice. Turn the thermostat off and heat pump comes on. Only way to turn off heat pump is turn off A/C breaker. Any help, thoughts or suggestions?

It ended up being a control board. I did it myself, with the encouragement from my husband. The reversing relay for a/c heat pump stuck and "fried". Replacing the board was easier than expected. Of course, after having to get to it. Also, needing small finger to remove wires and board. Then just a matter of replacing them, putting it all back together and now the A/C is working!

[Larry-NC]

Originally Posted by TX-Max

It ended up being a control board. I did it myself, with the encouragement from my husband. The reversing relay for a/c heat pump stuck and "fried". Replacing the board was easier than expected. Of course, after having to get to it. Also, needing small finger to remove wires and board. Then just a matter of replacing them, putting it all back together and now the A/C is working!