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  1. #1
    Join Date
    Feb 2008
    Location
    Portugal
    Age
    53
    Posts
    207
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    17

    Daikin 4mxs 80 fault



    Hi I have client and the code on indoor comes up u4 and the flashing light on outdoor means faulty compressor start up the client is a electrican also this job where the fault is, is 200 miles in the middle of know where so need some idea if it's a pcb board
    he says the unit does not come on heating or cooling or the compressor does not come on can anyone help



  2. #2
    Join Date
    Feb 2007
    Location
    UK
    Posts
    2,479
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    45

    Re: Daikin 4mxs 80 fault

    Well if he is an electrician, ask him to do an insulation test of the compressor itself and also to check the continuity of its windings.
    Then he can also check the output from the inverter with the compressor disconnected.


  3. #3
    Join Date
    Oct 2001
    Location
    Nottingham UK
    Posts
    5,733
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    51

    Re: Daikin 4mxs 80 fault

    U4 is a comms error not a compressor fault.

    Check you inter-connecting wiring.

    Sometimes, the installer runs the comms cable through the high float alarm on the pump so the system stops.

  4. #4
    Join Date
    Feb 2008
    Location
    Portugal
    Age
    53
    Posts
    207
    Rep Power
    17

    Re: Daikin 4mxs 80 fault

    Thanks sorted now the compressor gone

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