Question about Dometic Rooftop RV Air Conditioner

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After shutting off the thermostate switch, the unit sounds like it is running down before it stops?

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  • wildapowers Sep 16, 2010



    I have had this unit for over a year and this is first time it has happened. It still blows cold air until it shuts down. Could be low on freon and is building pressue up in the compressor? My home unit has "ramp up and ramp down cycles". This problem is not the same because the fan does not seem to be running a the correct speed after the thermostate is turned to the off position. Could the thermostate be defective?

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I would say it is normal operation. Maybe you just didn't notice before because it was more quiet. That has nothing to do with the R-22 Refrigerant pressure or thermostat functionality.
Good Day!! Thank you for using FixYa!!

Posted on Sep 17, 2010

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Has it always done this, or have you just noticed it? I've only worked on house units, but after turning the A/C off, they have a wind-down period where the fan still operates for a few minutes before shutting off.
Here is an excerpt from hubpages.com:
when I turn off my ac the compressor keeps running, I turned it in fan only and it still blew cold untill it froze up. the only way I could git the compressor to go off was to throw the breaker
after shutting off the thermostate - 1456888_50.jpg

Randy Godwin 2 weeks ago
This appears to be a switch problem, Tom! Depending on the make and model of your RV AC, the switch may be shorted out and is allowing the elec current to be supplied to the compressor at all times.
The inability to shut off power to the compressor using the off setting on the switch is an indication of a shorted switch! If you are familiar with using a multimeter you can check the switch before buying a new one! Order one online to save a bundle of money!

This might be normal, contact the dealer or manufacturer to find out. Google the brand and word support to find the support site.
Good luck, hope this helps, and thanks for using FixYa.

Posted on Sep 16, 2010

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sounds like maybe you have a wire touching somewhere in the thermostat or the thermostat itself is failing, are you turning the power off to unit or turning the thermostat to off .... if you are turning power off then try this frirst turn you thermostat down as low as it will go a wait 1 minute 30seconds to see if it goes off if not then (at thermostat) remove the wire hooked to "w" terminal which if done correctly should be a white wire ... wait a few minutes and see if the unit shuts down ..if it does not see if you are still blowing hot air as the fan may just be running...if the heat portion stops ,but you still have fan then remove the "g" wire also and wait about 90-120 seconds and see if the fan goes off... if all goes off then either you thermost is still calling heat for some reason or you have one of those wires touching the "r' wire somewhere making the call for heat....
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No i don't think your stat is bad as the unit is trying to run.There is a temp run switch in the plenum of the unit that could be causing this problem.

Its located in the metal box on top of the heater,it may be mounted externally also.

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Make sure there is nothing in front of the units, Chair, Couch ect, if you take the cover off the Units, you will see a little black Thermoster attached to the coil.
If the air bounces back off of something then it will cool that Thermoster and shut the unit down before the desired room temp is acualy reached.
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Hope this helps.

Good Luck!

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