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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The compressor needs to run, does it run? If it runs and the outdoor radiator is not producing heat, then it may be low on refrigerant. The compressor refrigerant lines, the skinny gets hot and the thick line gets cold under normal operation.
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If you have a window unit, you should have it serviced or replaced.

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Bought this LG unit (LWHD7000HR) summer of 2010 and it worked fine - used very rarely. Did not use heat in winter either. Went to turn it on this summer and it does not cool. Fan operates but compressor...

Unplug the a/c and check the control panel of your a/c. Unscrew the control panel to expose the wires and terminal lugs.Check for lose wires or terminal lugs or defects from the compressor capacitor. If all are OK try adjusting the thermostat switch to make the contacts work. If the capacitor is damage replace it and replace any damage terminal lug. If the compressor still does not work, check the overload and the compressor resistance. If overload is open, replace it and check compressor amperage. If the compressor amperage is high, you have to replace the compressor, vacuum, and recharge freon.

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Delonghi Pinguino K900, continued to blow hot air, what should be the solution. I want to enjoy the airconditioner aspect of the unit.

There a several things that can cause the problem you have described.

1. The Dehumidifier Mode is operating at the same time as the AC or is operation on it's on.
In dehumidifier Mode heat is produced.

2. Air filter needs to be removed and cleaned.

3. A blockage or crimp in the exhaust hose.

4. The exhaust has a leak or has come loose from the unit.

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

6. Compressor needs to be recharged with R134a refrigerant gas.

The 6 things listed above are where you need to start troubleshooting. 5 of which are easy to check and correct.

Hope this helps you and thanks for choosing FixYa.

Jul 21, 2011 | DeLonghi Pinguino PACL90 Portable Air...

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I have a Haier dehumifier that is 5-6 years old. It has not been used for a while and recently put back in use. recently I found that it does not pull water in the bucket with the same settings that was...

There are 5 basic, but solvable reason for what you described. None of them are related to the compressor. Please pay particular attention to numbers 1& 2.

1. The humidity extraction level is set to HIGH. Lower it to 32-35%.

2. Air intake filter is dirty or clogged. Turn unit OFF, & Unplug the
Unit, before removing to inspect & clean it, if necessary. If washed,
allow filter to completely dry before reinstalling. DO NOT operate
the unit without the filter.

3. Obstructed air flow. Maintain a minimum of 12 to 18" of clear air
space around the entire unit.

4. Cooling coils are dirty and need to be cleaned. Use warm water & dish washing liquid to
clean the coils. Rinse and wipe dry. Apply a light coating of WD40 to the coils.

5. Ambient air temperature at floor level is between 40 - 60 degrees.
dehumidifiers do not work well between those temperatures
(Unless, you have a Low Temp Unit). This applies mainly to
where the air temperature at floor level is colder than at shoulder
in basement applications. Raising the unit up off the floor,
onto a sturdy table, counter top, etc, that can handle the weight
of the unit, plus a full tank of water, will usually resolve this

If none of the above solves the problem, it may be a case of the compressor needs to be recharged with refrigerant gas. This usually occur in units that are 5 years old or older. It's rare in a unit younger than that. But, if it hasn't been well maintained, it can happen.

Hope this helped you to troubleshoot & solve the problem. Please let me know.

Jul 02, 2011 | Heating & Cooling

2 Answers


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.

1. The filter needs cleaning or replacing.
2. The cooling coils and/or the cooling fins may need cleaning.
3. Unit is in a window that gets direct sunlight for 6 hours or more.

Recharging the compressor (depending on where you live) properly to EPA Standards can cost $100.00 or more.

Hope this helped you. Please let me know. Thanks

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I had bought a Lg inverter wall mounted unit it worked about 3 days but it didnt cooled the area and i decieded to changed the outdoor unit(compressor)according to repairman's advice .during the first...

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 ???

Jun 16, 2011 | LG LSC121PMA Split System Air Conditioner

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We have 5 units that do not blow out cold air. They have been recharged with refrigerant twice and still do not Cool. One unit drips water heavily.

Before you had recharged your unit has the condition of the compressor analysed ? what is the condition of the condenser coils and the coiling coils.? Did you clean the filters? was the correct gas used for charging? Now go back to acess the fault that could have resulted in poor cooling. Dripping is indication of good cooling/ heat exchange , maybe this unit is working bettter. Since I am not aware of the age of the units, it becomes difficult to comment.
However please check with a clamp tester for the compressor motor current intake, failure of capacitor for low speed. blowing of fans, clean and check. Hope my advice helps you to recheck. Good day

Jun 28, 2010 | Heating & Cooling

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