Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

Unit keeps stopping when hot weather

I have a Mr.Slim in my shop in Hong Kong and whenever the outside temperature exceeds 30Deg C the unit keeps stopping and turning off automatically. I cannot restart the unit until it cools dowm later in the afternoon. I have had the unit cleaned and serviced but it continuously keeps stopping. The servicemen have no idea to why this is happening. Hope you can help so that we can pass on the fix to the next serviceman we get in. Thank you Kind Regards Dean

tbrown73 Jun 18, 2008

We have the same problem which has continued after being recharged with freon. No error codes on thermostat, just a flashing "filter" on the screen.

2 Answers

Anonymous

Hi, it's summer again and hot. Finally got someone with some brains to come and look at the airconditioner. I showed them your reply to what the problem may be and like magic, they re-gased the aircon and now it works perfectly. Thanks again Kind Regards Dean

Posted on Jun 27, 2007

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75 Answers

Hi, I am not familiar with your particular unit but it sounds like the compressor is getting too hot which could be caused by being low on freon. The large refrigerant line should be cold and sweat all the way up to the compressor after it has been running for a while. If it does, the freon is ok. It could also be a dirty condenser coil, bad bearings in outside fan motor or bad capacitor on fan motor or compressor. Check for wires that are burned or have been getting too hot. There are other things with heat pumps that could cause it but they are unlikely to happen. You might also want to make sure the voltage and hz is right. The only thing I could find information on was the 110/220 60hz (60C) You may only have 50hz power there. Good Luck. Let me know if I have helped. kstfas

Posted on Oct 25, 2006

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