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I have a Airton heat pump that wasn't working so at the end of last summer I had a professional come and have a look. He said that it was working fine and that it was the remote that wasn't working and to use another one. The temperature outside was 26 degrees at the time so he couldn't check if the heating was working but the air con was definitely coming on with the fan and blowing cold air. I went away for five months and the heating was put on in December. When I returned last week the unit is blowing cold air not hot. I turned the unit off and then back on to warm air and the paddles move and it switches itself on but no hot air blows and the fan doesn't come on. It is a bi split unit and the one upstairs is working fine. The gas was checked and that was ok too. So to reiterate it works on air con and the fan blows but it doesn't work on heating. Any suggestions?
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likely a bad reversing valve. need to be sure the reversing valve is getting 24 volts. if 24 volts present at valve coil, GENTLY tap the valve in hopes that it slides. ultimately need a new one.
Is this a heat pump or straight cool with heat strips. If straight cool the outdoor unit should not run in heat. If heat pump, did it work last year? If it did and now the outdoor unit will not run you likely have a bad control board. Possibly lost your settings in your tstat... check the stat first, make sure its configured for HP
It sounds like either the compressor valves have failed or the rev valve has stuck in one position. You don't mention if you looked at the operating pressures of the compressor that information would help.
The cord has a fuse at the plug. Check the fuse it could be blown. To access the fuse there is a slide open door that is about 1" x 1/4" on either top or bottom of the actual plug.
Is the compressor running? is the outside unit clean and free from debris? does this unit work in the heating mode during the winter, and is it still capable of that now.
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