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Hi, I have a wall mount midea split a/c model- MSG-36HR that will only heat. when put in cool mode it only blow's room temp air and the outdoor unit won't run. On heat mode it works normally. I have cycled power a couple of times, changed modes on the remote numerous times and just in case, changed the batteries in the remote. The unit is about 3 yrs old. Do you have any pointers. Cheers Tom

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Most heat pumps are 'fail-safe to heat'. That is: the normal position of the valve which reverses the function is in the position which provides heat. The reversing valve must be powered to switch to the cooling position.

Although the lack of valve function could be a mechanically defective reversing valve - it's more likely to be an electrical issue. Start with checking for power at the reversing valve's coil. If it's powered unpower it - you will be able to hear the reversing valve distinctively

Posted on Oct 03, 2009

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Posted on Jan 02, 2017

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