Question about Dometic Rooftop RV Air Conditioner

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A/C switching to heat

Hi, I have a 630516 unit that will run for a short period in the A/C mode and then switch to heat. I have checked power to the reversing valve coil and have power to it. Is the problem a weak coil or do I have problems elsewhere?
Jeff

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  • mechmagcn Jul 15, 2008

    After extensive troubleshooting, I figured out the problem. The coil on the reversing valve was getting hot and no longer able to hold the valve in the A/C position. After replacing this coil, the unit is working as it should.

    Jeff

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I have the same problem, it may cool for 1 min or 5 min then go to heat mode. Once it goes to heat mode only way to reset is to shut the AC down and let it cool. It may or amy not work the next time.

Posted on Jul 14, 2008

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Posted on Jan 02, 2017

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Tips for it: To get proper cold air set temp 23 degree and mode"cool". To get heat set temp 30 degree and mode in "Heat" Clean indoor and out door periodically ( Once in 4 months) Clean Air filter every fortnightly. Avoid frequent opening of the door where it's air conditioned. Avoid keep closing the doors even a/c is switch off. It helps to cool the room next times in short minutes. Use proper breaker, wiring for your air conditioner plug points. Make sure your elect meter is working properly.Check your Elect meter with 1000watts bulb for one hour. It should consume one unit only. Hope, it's helpful.

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When turning on my unit in heat mode the system cycles twice and will not come back on. it will call for heat but the burner will not ignite.


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To troubleshoot that effectively you will need to have an electric meter handy...

Then when it does not light...

Check for power going to the ignitor usually 120vac...if you have power then the ignitor is bad...

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POWERS OFF BY IT'S SELF


Hello FixYa customer,

There can be different issues in the mechanism or electrical that will cause the unit to shut down. However, since the power is going off completely after the initial plug in I suspect the power supply.

The SMPS, Switch Mode Power Supply has filter components that age due to heat, the voltage output on the filters reduces until the Micro Processor malfunctions and the unit won't stay on. The power supply filters can be changed by an experienced technician for $10-$15.00 in parts plus labor.

Thank you

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There maybe another plug with yellow wires. the plug with the 2 black wires is the one you want. Squeeze the side of the plug to unlock the plug then just pull out and test.

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