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We have a Dometic A/C unit on our 5th wheel. The fan is on, the compressor kicks in, runs cool with no problem, stays on for 90 seconds and then shuts off. The cycle cuts off short. We think we need a new capacitor. The model number is 57915.541 for the capacitor. Does this sound like it is the problem, where do we find this part to replace it? There are no certified technicians anywhere near where we are for the summer and the only way to get the unit fixed is to take it far away and leave it for days at a dealership. The unit is four years old and we've had this problem almost from the beginning. We told the place we bought it several times and they checked it out and said nothing was wrong.

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Hi, the problem may be as a result of bad capacitor as you have said but there are also a lot reason why the a/c stays on for some minutes and shut off.

You may indeed be low on freon and the low pressure switch is shutting the compressor down so that it is not damaged.

The compressor may be fine and the low pressure switch have gone bad.

The capacitor you are talking about may be bad.

Your compressor may still have some life left in it and needs what is termed a "hard start" kit. This is a kit for older units that assist them in starting.

Compressor may be bad.

Any one of these things could cause the conditions you are finding. You will need the proper equipment to trouble shoot what the particular problem is since there are no certified tech around you.You will need a set of guages to check the freon level and an ohmeter or multi-meter to check the electrical components. Without these tools, you will be guessing and you may end up replacing parts that are not needed and still have the unit having the problem.

My best guess at this point from what you are saying is that the thermal overload inside of the compressor is activating and shutting the compressor down. This happe when the compressor starts to draw up too much current at start up. If this is the problem, it is possible that you can remedy the problem with a hard start kit.

Take care

Posted on Jun 06, 2010

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