Question about Dometic Rooftop RV Air Conditioner

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Compressor does not come on

Unit has not been used in 6 months. compressor does not heat up. can it be recharged and if so HOW?

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First check that this is not an electrical fault. If it is an electrical compressor, check the supply and measure ohm value of the coils.

If the compressor is running, but not cooling, you have probably run out of gas.
Near or on the compressor will be a redundant pipe. It should have a valve on it, but sometimes for cheapness it's just cut off after filling.
There needs to be a valve fitted on the system for it to be refilled. You may have to buy one and braze it on the pipe yourself.

After this first hurdle, most vehicle spares suppliers now have kits for replacing vehicle refrigerant - complete with hose, pressure gauge etc . Just fill a little, and check for leaks, then fill up and test.

Thanks for using fixya!

Posted on Jul 06, 2008

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3. A blockage or crimp in the exhaust hose.

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5. The unit is sitting in direct sunlight or is adjacent to a heat producing appliance.

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4. Cooling coils are dirty and need to be cleaned. Use warm water & dish washing liquid to
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5. Ambient air temperature at floor level is between 40 - 60 degrees.
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in basement applications. Raising the unit up off the floor,
onto a sturdy table, counter top, etc, that can handle the weight
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Usually, recharging the compressor on a regular basis is not required. Does it seem like yours may need recharging? There are other things that can mimic low refrigerant gas in the compressor.

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You changed the compressor?? Why ??? These models do not normally have problems with this. I am conversant with most of the LS series and these have capacitor start compressors, which fail all the time. Generally all models have either a 45 /6 uf or a 50 /6 uf capacitor. If this fails, the compressor wont start, thus a no heat, no cool problem. If you have changed the compressor and made sure it is actually running, what is the operating pressure?? Suction side should be around 0 to -5 degrees c. Perhaps there isnt any gas in the system??
I assume by doing such a repair you are licensed to do so and have all the proper equipment to recharge the system ???

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