Question about Dometic Rooftop RV Air Conditioner
There should be power to one leg of the relay all the time. The relay is just a high voltage switch, the trigger engages the relay and delivers power to the leg that goes to the compressor.
Try jumping the low pressure switch to see if the compressor engages. Don't do it for long, if the refrigerant is low, the oil won't circulate properly and it can damage the compressor.
If jumping the pressure switch engages the compressor, check the refrigerant level. Best left to someone with a set of manifold gauges and the knowledge to use them. If the switch isn't activating, the Refrig level is very low [usually only takes around 4 ozs to kick it on, the system holds around 24 ozs].
Switch should be on the receiver/dryer. Follow the the ac lines and you'll find a aluminum can with two refrig lines going in and a plug on it. You jump the plug, not the switch with a piece of wire or anything conductive that you can get in there.
If the refrig level is good, I'd suspect the low pressure switch next.
If the refrigerant is that low, there is probably a leak. You can get a small can of refrigerant with uv leak detector in it and a uv pen light at any auto parts store. Follow the directions and check all the connections, hoses, the compressor shaft seal [if that's leaking, there will be oil on the bottom of the compressor too]
Posted on Aug 01, 2010
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Posted on Jan 02, 2017
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