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Old 10-02-2011, 12:26 PM   #1
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mitsubishi split system


we installed a mitsubishi split system mxz-4b36na. the a/c worked great in the summer but now we turned on the heater and it is blowing cold air instead of warm. we turned on the 4 inside units and it is the same problem. it is not blowing warm air. what could be the problem?

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Old 10-02-2011, 01:00 PM   #2
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mitsubishi split system


call mitsubishi. They do not operate as normal hvac equipment. Also download your manual from mehvac.com it will give some troubleshooting help.

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Old 10-02-2011, 08:00 PM   #3
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mitsubishi split system


Need make sure its hook up right and the reversing valve is shifting. I work on that kind unit all the time and did find reversing valves are bad. Matter fact the supply house were we get parts from say that recall had been sent out for those units.
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