Question about Fujitsu 18R1 Air Conditioner

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Will Not Heat

I have a Fujitsu Split System Air Con - the outside unit is a AOT18RNEL and inside unit a AST18RBA-W. The outside unit appears to be running fine, the pipes are hot but there is no heat coming out of the wall unit. I have cleaned all the filters and it still will not heat the room.

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  • tayls144 Apr 15, 2009

    Thanks for that, much appreciated. I checked and the fan outside IS running so does that suggest the compressor may NOT be working?? I am really hoping there is something I can do to rectify this before calling a professional.

    Thanks again

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On the outdoor unit the fan should not be running, on the indoor unit the fan should be running. If you then check the outdoor unit with fan not running, you should be able to hear clearly that the compressor is actually working. If this is all correct, it is possible that your fourway reverse valve is seeping and needs to be replaced.

Posted on Apr 15, 2009

  • Shane Seaman Apr 15, 2009

    What you can try before calling someone, is to change from heating to cooling and then back again. But when you change to cooling make sure you adjust the setpoint temperature to low (18c) and when you change back to heating set it back up again to 30 just to check. If you get someon to do the changing of settings indoors while you stand outside and listen to what is going on at the outdoor unit. Do not be in a hurry when changing over, it can take up to five minutes for delay timers to switch over. But when this happens you should hear a click and hissing sound as the valve changes over. If that happens and you are still not getting heating, you may just need a bit more refrigerant. ps. no the fact that the fan is running is possibly indicating that the unit is not correctly set to heating mode, check your remote settings.

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