Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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External unit noisy

When it is switched on, it behaves normally and provides cooling. After about 3 - 4 minutes has elapsed, the sound from the compressor motor indicates that the load on it is increasing. It will continue to get noisier until the motor finally comes to a stop (Sounds like a thermal cut-out has cut the supply to the motor to protect it) After about a minute, it cuts in again and behaves normally, but once again, the whole process is repeated as descriped above.

While the compressor is rotating, cooling is taking place.

The system was topped up with gas recently, prior to that, no cooling was taking place.

Posted by on

  • patfromwater May 12, 2010

    Thank you so much for your help "icemelts" You confirmed my suspicions. Sorry for not responding sooner....was away from home for a week.
    A leak developed in the system at one time. The gas (and I suspect some of the oil)leaked from the system. Do you think it could be caused by lack of lubrication??

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Sounds like bearings are out on the compressor. I'm assuming that it's not the fan motor making the noise, cause if it was - and the fan motor is cycling on and off - it (fan moter cycling on/off) will also cause the compressor to cycle on and off.

But, since you say it's the compressor (from which the noise is coming from) I would have to say the compressor's bearings are out and since it's a hermetic (sealed) compressor - your only option is to have a service tech check it out to be sure.

Note: I think you are correct (in thinking) a thermal overload is cutting off the compressor, because the compressor does have a 'saftey overload' built internally in the compressor just for that reason.

good luck!

Posted on May 04, 2010

  • icemelts
    icemelts May 14, 2010

    anytime your refrigerant leaks out - it takes oil with it - and a compressor running 'low on refrigerant' can be severely damaged if left to run in this condition for lenghty periods.

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