Question about Dometic Rooftop RV Air Conditioner

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Compressor on AC does not go off.

My compressor never goes off, even when temp is on lowest setting, and after leaving it on for quite a while there was not much force to the air coming out anymore. Is it freezing up? Why doesn't the compressor ever go off like my other AC unit?

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If it is sized correctly I would assume that the problem is a stuck contactor relay. They some times weld themselves closed when they get old.

Posted on Jul 07, 2008

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Posted on Jan 02, 2017

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Dear Mahesh

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Sounds like you may have a couple of problems there. First, have you checked incoming voltage to make sure you are getting 100-120 VAC at the AC control board in ceiling? If that's ok, try removing/disconnecting Ac compressor wire at ceiling control box and see if compressor shuts off then. May be a capacitor for compressor going or shot, and possibly relay in control box sticking, or bad wiring to thermostat. Have you had any lightning in the area prior to all this happening?

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what this simple indicate is that the thermostat of the power regulator is weak , meaning tat it will need a replacement with a better one .

the thermostat is connected to the compressor at the back of the air regulator it is black in color it look like a pot .

To locate this thermostat easily ,please trace the wire ( that supply power ) to the air conditional ,to what i connected to that is thermostat it i the power regulator it means thet is weak repleace it with a better one from any good tech office or shop around your vicinity please do this with care and make sure that all wire are well coonected back to the position as it was.

thank you.

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I know it has been at least a year since your post. I am answering the post to terminate FixYa site activity on the post.

Remove the front cover. Check the routing of the temp sensor wire. It should go from the bottom of the control panel to the plastic clip in the evaporator coils. If it is touching the eavporator coils it will sense the refrigerant temp and cycle off early. If the unit is freezing up there is a restriction in the coolant lines and usually will require the coolant system be purged of foreign internal debris.

Thanks for choosing FixYa.


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