Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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Gas heater I have a roof model airconditioner/gas heater. The trouble is, when it gets cold enough at night, the gas heater kicks off but no heat. I have to turn it off at the thermostat and back on, then it starts to warm up. Had the same problem with the old setup. The heater/airconditioner is new and have a new thermostat but the same old problem.

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Re: gas heater


Posted on Dec 15, 2007

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Turning on heater the AC unit kicks on. When using AC it won't turn off, just runs and runs and runs. Would this be an issue with the thermostat?

find where the thermostat bulb is located
if it is the ceiling or unit , it requires the unit to fill to the roof with cold air before it turns off
as most rv units are not insulated , the unit seldom fills with cold air enough to turn it off
I would get an accredited ac shop to check it out

Oct 20, 2015 | Dometic Rooftop RV Air Conditioner

2 Answers

Why isn't it heating?

Because its an air conditioner, not a heater?

May 03, 2015 | Air Conditioners

2 Answers

My AC blows a little warm air. It is a Goodman model with GAS for heating. The out side unit fan and cmprsr. both working.


Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool...

AirConditioner Trouble - Review the Possibilities


Apr 28, 2011 | Goodman Air Conditioners

1 Answer

Installing rv roof airconditioner heat strip

I see what you see also in the manual. The difference is the Heat Strip package that part is optional and the 600212-001 with the optional heat strips becomes the new 600315-001 I talked to Dometic Duo-Therm and the models are the same but they both are not heat pumps but the new heat strip package comes on when told to go into heat mode when you change the thermostat to heat. The part you purchased will fit both model numbers you listed for your roof top air conditioner. Thanks, Sea Breeze

May 09, 2010 | Air Conditioners

1 Answer

I have a suburban lp furnace and duotherm air/heat pump roof unit. duothern thermostat. 20 amp breaker kicked ( reset breaker) & furnace quit. NOW furnace fan comes on but does not light, and the front...

I'm not sure what the problem may be but you could try calling All Seasons RV Appliance Parts & Service. There number is 1-800-344-0673 they have helped me in the past. That and there tech calls are free so it wouldn't hurt to give them a call.

Jan 23, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Heating part of split system not working but fan outside is

if the cooling is ok then the reversing valve outside may be faulty

May 28, 2009 | Air Conditioners

1 Answer

Heater blows cold air when it is 30 degrees out side

heat pumps don't work as effient at that temp thats why they have 2nd stage supplemtial heat

Jan 09, 2009 | Air Conditioners

1 Answer

Intertherm heater blows cold air.

do you have elec or gas heat? nat or propane?

Nov 16, 2008 | Intertherm P3RA-048K Air Conditioner

1 Answer

Carrier weathermaker 8000

Hey Crystakwi, lets find out why with the informations you gave! this got to be a heat pump,-- up flow--you live in a cold climate--probably in the upper United States--! The Heat pump takes the heat out of the air down to 40*, then the auxillary heat kicks in , or you can just turn the thermostat to auxillary heat and it will kick in the back up heater, whethet it be gas heat --oil-- or electric heat to provide the heat from any degrees out side temperatures. Its cool , its just doing it job! Thank-you- very- much!

Nov 13, 2008 | Air Conditioners

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