Question about Dometic Rooftop RV Air Conditioner

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Compressor wont cycle off

When AC gets to the set point the fan shuts off but the compressor continues to run till it throws the breaker?

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Replace the contactor on top of the compressor. It is not telling the compressor to shut down

Posted on May 06, 2010

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I only see connection points for electric wire on top of the compressor.

Posted on Oct 22, 2012

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4 Answers

My domestic rv ac unit reaches the temp setpoint and the compressor shuts off but not the fan, it just keeps on running. Is this normal or should the fan shut off also?


Set fan setting to auto and not high or low setting. Fan will cycle with compressor after setting set to auto or " au" if a digital thermostat.

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I have a issue with my 2 Dometic DuoTherm air conditioners. The rv is a 2014 Palamuno Saber 50 amp fifthwheel. Ok. They cool very well but at different random times the compressor shuts off while the fan...


how long a power cord do you have and what size conductors are in it. when a a/c shuts down do to thermostat reaching its setting then trys to start back up shortly the pressures dont have time to equalize resulting in high amp draw. if fans runs all the time instead of shutting off with compresser it will call for cooling fast. i have a 2003 cardinal with 2 a/c's the smaller one has a continous fan & the larger one cycles fan with compressor. i have power cord rated for 50 amps. 110 to 115 is still a low vooltage condition.

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The cause of your problem can be faulty compressor clutch engagement. The fan which run along with air conditioner might be faulty.

Jun 10, 2013 | Cars & Trucks

1 Answer

Ac fan will not run on high setting , manual or auto . when unit calls for high setting fan shuts down . Compressor continues to run and trips breaker in trailer . Someone thinks it may be the motor, but...


Most probably its weak motor.When the motor gets weak it trips/ stops on high setting.On high setting motor needs more power to run the fan.Try lubricate the motor .You may need a few drops of oil on the fan motor bearings. As they get older they get dry and gunked up. If you can see the bearings a few drops of oil may help. --------- Because the fan operates on medium and high, so loose wire or faulty fan switch is very rare to cause this problem.-------- As per the problem , it requires motor to be replaced.--------- This will help.Thanks.Helpmech.

Jul 29, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Blows and fan kicks on but air not cold


Is the outside compressor running? I would check the capacitor. Look for swelling as a sure sign of capacitor failure. have you tried resetting the breaker? Sometimes that works but it don't cure the real problem. If the breaker is tripped lokk for reasons why it would trip the number one reason being a broken wire going off to one of the compressor terminals or a shorted capacitor. Capacitors can be bad in several differing ways, shorted, open, or wrong/out of spec caps can cause trouble. Is the contactor pulling in on the compressor side? Something gets under there and that can throw a monkey wrench in there also. 220 volts cal kill you so make sure you got the power turned off to the unit before attempting to do any repairs and if it is wet outside wait till the ground is dry. More here
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look for signs of burnt contacts on the contactor. Check the small coil under for continuity and make sure 24 volts ac is getting out there.
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If the motor ain't turning fast or growling at ya then use zoomoil to lube it up. Get some coil cleaner and go by directions wash down the condenser. Change the indoor air filters.
Make dang sure the power is off to the unit before doing the suggestions and do not get the motor wet or wait till it drys thoroughly before turning the unit back on.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

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Need a point setting for ao smith air compressor ac motor model number opa-0297 s# c56b72b2316508j2 work on air machine with motor installed motor will hum and trip breaker can we set points to stop trip...


There is not a point setting for air compressors. The pressure switch can be adjusted. Remove the cover from the pressure switch. Adjust the nut tighter for a higher cut off pressure or looser for a lower cut off pressure. It sounds like the compressor is trying tostart under load. If the unloader valve is not working, the compressor will draw excess amperage and do what you describe. The unloader valve releases the pressure in the cylinder at the end of the run cycle so the compressor can start the next run cycle under no load.

May 14, 2010 | AO Smith 2 Hp Spl 3450rpm M56 Frame...

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Goodman GSC130361DE premature shut off


im not sure what tstat you have? if you still have your tstat book it well tell you how to set it up. may be it was not programed when installed. i hope that helps

Apr 06, 2010 | Goodman CLQ30AR32 Air Conditioner

1 Answer

Need a point setting for ao smith air compressor ac motor model number opa-0297 s# c56b72b2316508j2 work on air machine with motor installed motor will hum and trip breaker can we set points to stop trip...


try running up this motor when its not installed on the compressor,, if it still blows the trips the motor is faulty,, if it runs ok, but hums when reconted to the compressor the compressor if far to tight for the motor to turn the compressor,,,you can not reset the points in a breaker trip they trip at a set curent if the motor is pulling more amps than the trip is set for it will trip the trip to turn off the curent, the motor will pull far more amps than it should if its over loaded thats why its humming its trying to spin up it but cant so it just keeps pulling more and more amps till the trip cuts out

Mar 25, 2010 | AO Smith 2 Hp Spl 3450rpm M56 Frame...

2 Answers

AC wont kick on....


The first thing to check is your breaker box. There should be one double breaker for the air handler unit, that's the inside unit, and one double breaker for the compressor, that's the outside unit. Check both breakers. If you're not sure if they've be thrown, click them toward the outside of the breaker box (off position) and then click them toward the inside of the breaker box (on position). If the breakers are on and you still are not getting any A/C take a look at your compressor, (outside unit). If the fan is running at least you're getting power. However, your compressor down inside the unit may not be getting power or it may need to be replaced. The compressor has a start-up cap. If this cap goes bad or the wires from this cap fry or corrode away, this will also keep the compressor from starting but the fan will still run. If the fan is not running it could be caused by a faulty relay inside the compressor cabinet. This relay is supposed to open and close based on a low voltage signal from the thermostat. I believe it's roughly 24 volts. This relay switches on and off the 240 volts for the compressor and the compressor fan. Often this relay goes bad or the wires leading up to it fry. If you?re going to work on the unit yourself make sure all power is shut off. There should be a shutoff switch on the outside wall near the compressor. I?d also shut the breakers off.

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