Question about Dometic Rooftop RV Air Conditioner

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During low voltage period window AC compressor shudders and kicks off, but fan runs, when voltage returns normal compressor runs.

My window airconditioner compressor shudder and kicks off when the AC voltage fluctuate to lower value.

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Low voltage issues causes higher amp draw and equipment to run a lot harder. whats causing the low voltage problem to the equipment? high amp draw of the compressor could be causing it to overheat and trip until the compressor physically cools down.

Posted on May 27, 2009

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Rear ac unit keeps kicking off says low power the fan will run on auto soon as u kick on ac or heat it kick of and says low power front unit runs good dometic unit


Check your breakers and make sure you are getting the required voltage. Sounds like you are not getting the correct voltage to the system.

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I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
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Hello, I have a duo therm ac unit, the fan works fine in all the Fan only speeds, but when the ac is selected, the compressor comes on and the fan drops down to less than half speed. you can hear the fan...


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Sep 14, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

WHEN COMPRESSOR KICKS ON THE UNIT SEEMS TO LOSE ALL POWER AND DOES NOT COOL. AS SOON AS COMPRESSOR KICKS OFF THE FAN RETURNS TO NORMAL SPEED BUT NEVER PUTS OUT ANY COLD AIR


HMMM this sounds like a couple things possible Low voltage due to lose wiring some place. or low voltage due to the power company . something is pulling more amps than it should.

Jul 18, 2011 | LG LWHD1200FR Wall/Window Air Conditioner

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Sounds like the some issue I have with my Mom's 96 Cav. No Cmprsr


I would check the freon level in the AC system. The computer looks at the voltage from the pressure switch in order to activate the compressor clutch. If the voltage is not in the right range the computer will not turn on the compressor and in turn will not turn on the cooling fan. It is set up this way in order to prevent damage to the AC compressor. I would almost bet that the system is low and may have a small leak. Your local mechanic can check it for you and correct the charge level as needed.

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1 Answer

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If the compressor never kicks in, I would check the start capacitor, thermostat and the compressor windings. Most times the start capacitor is defective. Some window air conditioners the fan will run while the compressor stop through the thermostat switch. If the thermostat switch is bad every thing runs except the compressor. Let me know, Thanks, Sea Breeze

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