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Duro Therm. AC fan comes on but compressor takes 5 min. before

I think the thermostat may be faulty. Fan comes on but it takes 5 min. before compressor will come on.

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Compressor may have five minute time delay for compressor protection. Russ

Posted on Jul 19, 2009

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Why is my air conditioner unit only running properly on cool days? when its hot out it only runs about 5 mins at a time then shuts off to fan and dont come back on for another 20 mins.


Do you hear a click sound as the compressor shuts down? If so that is the clixon (heat sensitive circuit breaker) that is opening and shutting down the compressor when it overheats. You have not had the AC filled with refrigerant so overfilling the unit cannot be an issue.
And if it is not overfilled overheating is caused by excessive current going into the motor which could indicate a problem with the motor windings..

OR, If the thermostat is faulty it could be prematurely shutting down the compressor. If you jump (bypass) the therm and unit does not shut off then you have found the culprit.

Sep 08, 2015 | Heating & Cooling

1 Answer

I have a Dometic 15K roof Ac on my FW. After the AC reaches therm temp, the compressor and the fan turn off, but the fan starts right back up again and runs until you set the thermostat on off.


That is normal operation, only the compressor cycles, the fan stays running to keep air circulating for better temp control. Otherwise the rear of the space could get 5 degrees warmer than the front

Feb 23, 2015 | Dometic 459516 459516.XX1C0 Brisk Air...

1 Answer

My Duo-therm Brisk-Air by Dometic rv ac wont cool.(The fan runs )


Usually just listening closely will give you a rough idea where to look for problem. When you have the fan on and switch to cool, (with temperature turned down low obviously) do you hear any type of "moaning" sounds from AC unit, or see lights in RV dim slightly indicating that compressor is trying to engage? Is the breaker tripping when compressor tries to engage? Do you hear a "click" from AC unit when switched to cool? If none of that happens, then I'd start thinking thermostat, or compressor relay. Normally if it's a faulty capacitor, the compressor will try to engage but will make a "moaning sound" and usually trip the breaker due to excess current draw. Someone experience in electrical should be able to test relays etc, but whoever does work on it, should be aware that those capacitors, as well as hydro in general are very dangerous to work with. The ("zap",- Shock) that you can experience from a capacitor or hydro, can be fatal.

May 27, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Duo Therm AC Not Cooling


most likely a thermostat problem most rooftop air units fan will blow cont. and compressor cycles

Jul 26, 2009 | Heating & Cooling

1 Answer

Thermostat slow to turn AC compressor on. fan comes on but takes 5 min. before compressor comes on


Most a/c's have a 5 minute delay before the compressor turns on and they will do the same when changing from cooling or heating to cooling.

Jul 19, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

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.

Jun 29, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

Duro-therm rv roof a/c..model 57915.331...compressor coming on..fan not running..after a couple min. breaker trips....fan will not run on manual or auto...help,blackie williamson


Either your fan is stuck due to age or grime or is shot

if the fan does not provide cooling then the unit goes into thermal protection mode and shuts down

Jun 09, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Penguin Duo therm AC bogs


Try replacing the wall thermostat with an electronic unit. It sounds like it is short cycling. If there is not at least 5 min delay before trying to restart the compressor this is what happens. Most electronic thermostats have a delay feature built in to solve this problem.

Jul 08, 2008 | Dometic Rooftop RV Air Conditioner

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