Question about Dometic Rooftop RV Air Conditioner

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I have a Dometic Duotherm A/C with an analog thermostat control box (just replaced) and when the thermostat cycles the unit the fan shut down like its supposed to but the compressor keeps running

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  • Charlie Gibson May 02, 2010

    What is that? and what does it look like ? the only controls are in the box!

  • Charlie Gibson May 02, 2010

    The control box is the only control on the unit except an anti-freeze that connects to the condenser fins all other wires are to the capacitors it has no outside contacts

  • Charlie Gibson May 02, 2010

    The compressor does not reverse only ones that do that are heat pumps and this is a straight A/C

  • Charlie Gibson May 02, 2010

    The unit cools fine it doesn't need freon The unit works like a central unit when the thermostat tells it to, the whole unit shuts down, Its not doing that the compressor keeps running

  • Charlie Gibson May 02, 2010

    there is no relay all it has is the new control box

  • Charlie Gibson May 02, 2010

    Dont have one that i can upload to you only thing I can think of is the control is defective

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  • Master
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Do you have a schematic you could email me? nitensheaterservice@earthlink.net

Posted on May 02, 2010

  • Brian Niten May 03, 2010

    I think the compressor and fan run off the same contactor but if they don't maybe the contactor for the compressor is sticking.

  • Brian Niten May 03, 2010

    I was looking at the picture you provided and looking back at your posts. From what I can gather from them you're saying there are no contactors or relays outside this metal box that you replaced. I see in the picture there is a relay with a normally open connection (NO) and a common connection (COM). I can't tell if that turns the compressor on and off or not from the picture because it doesn't show what the wires from the connection labeled A/C connection go to. If you can determine where the wire on the #2 terminal go to let me know. With the unit not running you can check the voltage between NO and COM. It should read 115 vac. This means the contacts are open. Next start the unit and read voltage between NO and COM. It should then read 0 vac because the contacts will be closed and there will no potential difference between the 2 points. Remember though that it will still have 115 vac on it there just won't be any voltage dropped between the 2 which is what you are reading. Next when the unit shuts off and the compressor is still running check the voltage between NO and COM again. If it is open it will read 115 vac and will not be what is controlling power to the compressor. If it is still closed it will read 0 vac and I think will show us that it is controlling power to the compressor. Let me know what you find. Also use caution so you don't get shocked!!!

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  • Master
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Hi,the problem you are encountering is as result of the fact that the relay switch that connects the wires to the compressor is bad and needs to be serviced or replaced,but i'll advice you replace the relay switch as a lasting solution.When you take your device apart ,you will find a switch attached to the compressor,that's the switch that needs a replacement.

Thanks and take care

Posted on May 02, 2010

  • Oyelade Gbenga May 02, 2010

    Hope you have seen the relay switch that needs to be replaced,

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It sounds like your A/C unit may require recharging.

If the pressure is low, the compressor stays on all the time because it is trying to compress the refrigerant.

I hope that helps.

Posted on May 02, 2010

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Depending upon the model of your air conditioner, this may be normal operation. Air conditioner will run the compressor in a "reverse" mode without the fan occasionally in order to heat the coils. This is done to defrost the coils. After the frost is gone, the fan switches back on and everything goes back to normal.

Posted on May 02, 2010

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Your compressor censer is not working propely chacge that

Posted on May 02, 2010

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