Heat Pump Not Heating

[restlesswind]

Our fifth wheel has a heat pump on the roof for heating /cooling.
The cooling part is working fine.
The heating part is not co-operating at all. It tries to start,then shuts down.It is supposed to then switch over to the gas furnace,but it does not.
The outside temp was close to 65f. The air conditioner cools just fine. Any ideas as to what to look for.

I'm thinking maybe the thermostat But(?)
We do not need the heat pump heater all that much because we do have the gas side but I do want it to work.
Thanks
Ed

[CW5DJSRES]

Doug I have a Allegro Bay with heat pumps and was told they do not work below 50 or 40 degress. The OP said it was 65 so should have worked. That being said, I use the gas heat as it is quiter and seems to be more effeceint.

[dougrainer]

1. Your Furnace should operate regardless of the HP. The tstat will have the option of either gas furnace or the HP function. You do NOT have to rely on the HP kicking out and then wait for the furnace to come on. repost after you have tried the Gas furnace only mode.
2. RVP, all the HP does is reverse the flow of coolant to Heat rather than cool. You have a reversing valve that is electrically operated to open and close the reversing valve to either Heat or Cool. THAT valve, if failed would NOT keep the unit from coming ON.
3. Please state exactly what happens when you go to HP. Does it NOT come on at all? Does the fan come ON but when the compressor tries to start it kicks out?
4. IF your wall tstat does NOT state HP on the cover name or does NOT have a "Gas Heat" and a "Electric Heat"(this is the HP side) switch, you do NOT have the correct Tstat for you system. It will usually state similar to ---RV Comfort.HP that designates a HP wall tstat.
Since you state a 90000 series your wall tstat should have a LCD display. Does it? Doug

[restlesswind]

SuperDutyFiver wrote:
Make model and year will help us all to help you-I've done a descent amount of troubleshooting the Carrier Air-V and there's good info online to help. Heat pumps have a number of critical sensors and valves. So which one is it???

With the lack of printed material,the best I can come up with is that it is an RV Products 9000.The T stat is a RV Comfort Coleman Mach.
Somehow the books for this unit did not find there way into the Trailer owners manual.
It may be time to get the credit card out.

[SuperDutyFiver]

Make model and year will help us all to help you-I've done a descent amount of troubleshooting the Carrier Air-V and there's good info online to help. Heat pumps have a number of critical sensors and valves. So which one is it???