Question about Dometic Rooftop RV Air Conditioner

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Fan starts but compressor wont cut in on b3200 roof aircon. Cant hear thermosthat click in.

Air con has been working OK. Turned on this morning fan starts but compressor is not operating. How can I check thermosthat & could gas be low causing compressor not to cut in.

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  • Dometic Master
  • 1,363 Answers

Check dc fuses and 120 breakers,. could be thermostat or relay board issue

Posted on Aug 18, 2015

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Posted on Jan 02, 2017

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SOURCE: fan cutting on and off every 5 mins

The only thing that is going to but the fan off is the thermostat. When the fan stops, immediately check the thermostat on the wall. See is there is power between the B terminal and the GH terminal. If none, then replace the thermostat. If there is, then replace the control board in the AC. That means that the fan relay on the printed circuit board is weak.

Posted on Jul 04, 2009

  • 141 Answers

SOURCE: Fan does not run. Low power hum audible.

sounds like you have a bad run capicitor on your fan check if the cap is swolen and or any oil around the terminals thats usualy a tail tell sind thats its bad

Posted on Apr 08, 2010

hvac1960
  • 2133 Answers

SOURCE: I have Dometic Roof Top Heatpump Model B3200 It

To getproper heat, keep your temp setting at 30+ degree and also mode in "heat"position. If still no heat, check your heating sensor for closed circuit by anOHMs metre.It it's with RV, check power to RV

Posted on Dec 30, 2010

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1 Answer

I have a Dometic B3200 / 3253.332 roof a/c The problem I have is on a very hot day the a/c will run for lhours at a time then the fan will cut out however you can still hear the compressor


it is possible that the condenser is too hot to transfer the heat because the air temp is too hot
test that by spraying water into the fan ( mist) to cool the condenser and see if that stops it
or move the unit to a shady area rather than on the roof top

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probably a relay on module either bad or not communicating with thermostat.

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check the freon, if there isn't enough it won't engage, could also be the low pressure switch or a fuse.

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Hi, The air con in my 2003 Audi A6 1.9 tdi 130 is blowing warm air the air con rad is fully gassed and all fuses are ok . Thanks in advance for any advice on how to fix


The only other thing then would be if the compressor is turning, engaging, and the cooling fan working properly. You should either be able to see the compressor clutch engage, as the switch is energized, or at least hear it click loudly when the switch is energized. If it is not, then there are sensors for the low pressure/high pressure line to tell the compressor when to function, that also have to be checked.

As the engine runs with the compressor turning, one line should be hot/warm, the othe,r (larger diameter hose) should be cool/cold, if the system is working properly.

If the compressor is turning when you have the A/C turned on, then see if the cooling fan is running as well. It must run to remove the heat and cause the process to function properly.

Good luck!

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1 Answer

I have Dometic Roof Top Heatpump Model B3200 It will not turn on when it is a cold morning. The only way to get it started is to heat up the air in the caravan using a fan heater. This somewhat stupid...


To getproper heat, keep your temp setting at 30+ degree and also mode in "heat"position. If still no heat, check your heating sensor for closed circuit by anOHMs metre.It it's with RV, check power to RV

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the blower motor has no affect on the AC system,
start the engine and turn on AC and watch the AC compressor to see if clutch engages,if it doesn't the system isn't full,if you are correct the clutch should be engaged and should quit when you change heater speeds,

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The fan in the outside part of my AC doesn't run


On most air cons there is a time delay before the outside unit starts and LG are no exception. This function means that erratic power supplies wont kill the compressor (outside bit). If the internal fan runs for a few minutes and then the trip goes then it sounds like you have a faulty compressor. This tends to be a scenario for a failed compresssor. What you can try is putting the unit on FAN ONLY (no cooling) and see if the power stays on. If you are more technically competent you could isolate the power to the compressor on the external unit (AFTER ISOLATING THE POWER TO THE WHOLE SYSTEM). And then try putting it on cooling to see if the external fan works. If the trip is not thrown then you have a faulty compressor. I would also like to point out that most A/C manufacturers offer a three year parts warranty so you may have some sort of cover depending on the age of your unit. In which case get an aircon guy out who knows what they are doing (personal reccomendation is always a good starting point). Hope this helps.

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