Question about Dometic Rooftop RV Air Conditioner

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Model 630516 the compressor shuts down and fan keepsrunning, almost seems like the heat pump comes on. Unit is set in auto run mode when this happens.

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On this device the heat pump uses the same compressor as the AC so it can't just jump from one mode of operating to the other.
In Auto mode the compressor shuts down when the set temperature has been reached and the fan is kept running for a while to keep absorbing the residual heat - the same way the fan on a car's radiator is kept running for a while after the engine has been stopped.

Posted on Jul 06, 2010

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Posted on Jan 02, 2017

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What temperature is this heat pump being run at? If it is low ambient temp outside this may be running in what is called defrost mode to where the compressor will run without a call for heat. This seems normal to me as long as the setpoint temperature is being reached.

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2. Check it's in heat "mode"
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1 Answer

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I have had the same problem. Following the advice of someone on these pages I opened the machine up and checked the fan with a meter. On my model (the 404) it has two settings so two leads; one seemed okay, the other was dead. I checked the circuit where the fan connector plugs in and I got that both speed settings were supplying plenty of juice. Apparently the fan motor is dead. A replacement runs $79 at http://www.appliancefactoryparts.com/. I ordered one; we'll see what happens.

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I believe the problem in lies in the dual stage heat mode setup on the thermostat, but the unit going into defrost does make the unit act kinda strange. Even more so than other types of equipment. I would suggest hiring a licensed HVAC service technician if the problem cannot be resolved by yourself.

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Does it look like the coils are frosting over? Is it steaming? Keep watching, after about 30 min does the fan come back on?

If yes to any/all the above then the unit is probably in defrost mode and yes the fan will stop blowing during that time, but restart when the unit goes back into regular heat mode.

During this time you will likely notice warmer heat from the vents than normal and the "AUX or EM HEAT" light will be on.

That is your backup heat system. It should automatically come on during a defrost cycle.

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Check your wiring between the contactor and compressor for a short to ground, or check the compressor windings for short to ground.
With the Tstat off, the contactor should be open so the only way for the compressor to be trying to do anything is if the 110 volts from the unbroken side are traveling through the compressor to ground. Since 110v is not enough to run it, the overload is kicking it out, cooling off, and repeating the cycle. When you kick on the Tstat, the contactor is supplying voltage directly to ground without going through the resistence of the compressor windings and kicking the breaker.
Post back and let me know what you find.

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