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  1. #1
    wanes98's Avatar
    wanes98 Guest

    P8 message on Control Board Mitsubitsh mr Lim



    Hello
    I am servicing a unit(Mr. Slim) which is a ductlee made by Mitsubitch. The control board (thermostat) displays the code P* does any one what is that
    Thanks



  2. #2
    chilled2005's Avatar
    chilled2005 Guest

    Re: P8 message on Control Board Mitsubitsh mr Lim

    hiya i think p8 is a pipe sensor fault, dont hold me to it but im quite sure off the top of my head...its either faulty or not there at all or not sensing the temperatures its looking for e.g. short of gas...

  3. #3
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    Re: P8 message on Control Board Mitsubitsh mr Lim

    Last edited by frank; 25-04-2006 at 07:33 PM.

  4. #4
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    Re: P8 message on Control Board Mitsubitsh mr Lim

    is a p8 fault just not an outdoor fault?

  5. #5
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    Re: P8 message on Control Board Mitsubitsh mr Lim

    P8 means "Abnormality in Outdoor Unit"

    Possible causes

    1 Wrong wiring of Indoor/Outdoor connection
    2 Reverse Phase
    3 Protection Device operated
    4 damaged Outdoor coil thermistor

    Areas to check

    1 Check continuity of the interconnect wiring - look for breaks (I've had it where rats have chewed the wiring before )

    2 Check the phase rotation - has any work been done on the unit mains wiring?

    3 Has any safety activated? Compressor klixon? LP switch? HP switch, Fan overload? etc.

    4 Measure the resistance of the coil sensor

    If you are still struggling then give Mitsi Technical a ring 08703000300

  6. #6
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: P8 message on Control Board Mitsubitsh mr Lim

    A list of Mitsi fault codes is available here:-
    http://airconwarehouse.co.uk/Techmanuals.htm
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

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