Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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Mr.Slim Mitsubishi dual zone system

Our Mr.Slim dual zone system has two 15,000btu indoor units with matching outdoor compressor. I can turn both on and it cools well but after a little bit one or the other will continue blowing but not cooling even though it has not reached the temperature (for instance 75 degrees) while the other continues cooling well below the temperature requested. It feels like we're chilling milk in one room and way too warm in the other. I tried resetting the remotes but it didn't change anything. It seems that whichever indoor unit comes on first is the one to stay on and keep cooling and the second one turned on is the first to stop cooling. The fans work great and dampers etc is top notch but it seems like the refrigerant stops passing in one or the other for some reason. Any fixes that can be done? Surely both can be run at the same time! Thanks for giving this a think.

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  • laforice Jun 08, 2008

    have the same problem. In addition, I have a third unit in a location not far from one of the problem units. When that one is on, it seems that the temperature of the problem one is regulated by how cool that one gets. Bottomline - it seems that when the working one begins cooling off the zone it's in, the problem one starts cooling as well. The zones for both the working unit, and one of the problem units are in an open space similar to a loft.

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We had that problem with two units that we just had installed. Both are hooked up to one compressor. After several calls and the service person coming out twice, it turned out that they had two wires mixed up when they did the installation. Once they switched the wires the units ran ok.
BUT...now we are having another problem with the units/compressor not working after losing power in our house. We lose power on a regular basis here. Does anybody know if that means we will constantly need to call the service people to come to get the compressor working again? Or is there anything we can do to reset it? The service person that came today was not very helpful and didn't have a lot of answers for us.
Thanks

Posted on Jul 23, 2008

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