Question about AmcorAire UCHW-H24AF2 Split System Air Conditioner

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I get an External Feedback fault E7

I tried to turn on the heat and got a external feedback failure. This is a heat and cool model nini split.

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  • dwhitley7 Dec 13, 2008

    I have the same problem, supposedly brand new unit!!!

  • Anonymous Feb 20, 2009

    I have the same problem.

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SOURCE: ramsond a/c trouble code E7

Indoor/outdoor communication, you can check the connecting cable may have damage.

Posted on Mar 20, 2009

  • 1 Answer

SOURCE: I have an 18 K unit with E7 error on heat mode

I just installed a YMGI brand mini-split AC and had exactly the same problem. AC worked fine, but when I tried using heat mode I would get an E7 error.

After talking to their tech support I discovered the problem. There was a separate cable that needed to be connected that I'd forgotten to hook up. This cable runs from the internal unit to the outdoor unit and connects a defrost sensor.

In my case I had totally missed that cable when I installed the unit. After running another line and connecting it the unit is now functioning normally.

If this is a new install, then make sure all your cables have been run. If it was previously working, then check to see if one of the cables had become disconnected. If it's not the cable, then it's probably the sensor.

Good luck

Posted on Oct 31, 2009

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