Heat Pump Not Heating

TennesseeBob wrote:
Might be your reversing valve stuck or not working

X2
Don

Won't venture a guess on what could be wrong but, I have a heat pump at home and it works very effectivly to around 30 degrees. after that it becomes cheaper to heat with gas. Now i'm talking natural gas. Because propane costs more, it may be cheaper to continue using HP down to 25. There is always heat in the air, all the way down to absolute like -245 but it is not practical. the electric used would not be offset by the heat.

dougrainer wrote:
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

The Tstat does have gas or elect position
When it is on "gas" I get heat
On "electric",no heat,no blower.
If the stat is turned high enough,on electric,it will kick over to gas mode and heat the trailer.
The Tstat is the original one that came in the trailer ( We bought the trailer new)
It is the RV Comfort HP,Coleman Mach Model With an LCD display.
We use the gas mode more often that elect,as was said,it is more quite.But getting ready to travel in the spring I like to use the CG power and save the propane.
Even if I can't get it working,with your help,at least I won't seem like a complete dummy when/if I call a tech to fix it.

Might be your reversing valve stuck or not working

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.

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

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.

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???