Question about Coleman Mach III Air Conditioner

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Compressor wont start

My bus has a rarely used older unit that ran perfectly until last week. I noticed that during the cycle to start the compressor, it slowed down for about 10 seconds, compressor does not start, then fan resumes normal speed for a couple of minutes. it then lugs down again (fan also) for the 10 seconds or thereabouts, thens resumes normal fan operation for a couple of minutes or so. Its like it cycles for the compressor and when it doesn't start, it waits a certain period then does it all again. I was working in the bus when it did it and noticed it immediately.It worked so normally I have a hard time thinking its the compressor.

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  • stproman Jun 23, 2008

    That makes sense. The unit ran perfectly until the evening it started cycling repeatedly. Its an older unit that was on an older bus conversion I am restoring, and had very little use, which can be bad. I tried it the next morning and it was exactly the same. I will pull the cover and check the compressor for grounding and go from there. If I have any further questions I will go for the premium assistance. I appreciate you. LS

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It is probably a failed run capacitor for the compressor. Without the capacitor, the motor can't even try to run, but it will draw extreamly high amperage until it trips the thermal overload (avarage trip time 5-10sec) after it has a few second for the safety to cool off, it will try again. Either that or the compressor truly is seized

Posted on Jun 23, 2008

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Hello kamper2 - Sorry for the delay in answering. I had a response prepaired but something cleared it on me about 2AM last night and I just couldn't think any more. Sounds like your problem is similar but different. I don't think you have to spend any more time on the roof looking at the roof unit. I have been working with a tech and Dometic for over 6 weeks. Right now I am running my A/C on an extension cord out my window and over the the power pedestal for power. The 12 VDC to the A/C circuit board is coming from a car battery sitting on my kitchen floor. The communication cable is a 25' telephone extension cord draped over my kitchen slide over to the CCC. Last week end I turned off all power to the trailer (110VAC and 12VDC) and sat here all day running just the A/C. It shut down 6 times. This was an effort by Dometic to eliminate RF energy affecting the microprocesser on the A/C control circuit board. Apparently the CCC and A/C control circuit board have some idiosyncrasies that aren't well explained. I also have an extended warranty on my A/C with Dometic. I'm thinking they believe RF energy may be picked up via the communication cable and affecting the microprocessor. Do you have a cell phone, wireless router for your computer or telephone or something that may put out noticeable RF energy? If you do, turn it off for a while to see if that may be related to the shut down's. I'm still working on my problem and no solution or reason yet. The circuit board in my A/C has already been replaced. I am assuming you do not have an icing problem with the problem A/C. If for some reason you decide to replace the communication cable from the CCC to the A/C circuit board, be aware that a typical telephone extension cord will not work. You must replace one of the plugs so the wires are straight through (pin for pin) and not reversed as the typical telephone extension cord is. Good luck with your detective work! azbill375

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