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  1. #1
    derekbradbury's Avatar
    derekbradbury Guest

    mitsubishi mr slim



    Hi all,

    This Mr Slim just brought up a phase rotation fault when the sparks pulled fuses out one by one. The sparks put the fuses back one be one and two out of the three units showed a phase rotation fault.

    ANY IDEA WHY?

    Thanks



  2. #2
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    Re: mitsubishi mr slim

    what works did the sparks do while the fuses were out?
    Paul


    "KEEP IT COOL"

  3. #3
    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: mitsubishi mr slim

    Have you switched the unit off and on again after the sparky played with the fuses ?
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  4. #4
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    Re: mitsubishi mr slim

    On the old fixed speed units if you run for any time on 2 phase then the compressor motor windings will burn out. Unit would only stop if control board supply phase disconnected.
    On newer inverter units pulling fuses one by one like this could potentially cause damage to the inverter.

    I think most 3 ph Mr Slims have always had phase rotation protection because the scroll compressor needs to spin only one direction.

    Did the unit run ok after power reset ?

    If not then there may be some damage which will need further investigation.

  5. #5
    derekbradbury's Avatar
    derekbradbury Guest

    Re: mitsubishi mr slim

    The unit did not still has a fault, two units have a phase rotation fault. one unit was fine. the sparks pulled fuses to do his five year electric test. after his test he put the fuses back and two out of three units have this fault. the units are 7 years old.

  6. #6
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    Re: mitsubishi mr slim

    To eliminate any mains supply problem you need to use a phase rotation tester at the isolator.

    We had the same fault occur after a sparky replaced the outdoor isolator due to vandalism, but we traced it back to a faulty mcb - just coincidence with the work the sparky did.

    If the Mr Slim can't see 3 phases you get the same fault code.

  7. #7
    JDT83's Avatar
    JDT83 Guest

    Angry Re: mitsubishi mr slim

    Any Info on why i cant get 12v reading going to controller par21

  8. #8
    cosmaniac's Avatar
    cosmaniac Guest

    Re: mitsubishi mr slim

    Quote Originally Posted by JDT83 View Post
    Any Info on why i cant get 12v reading going to controller par21
    reasons why

    no supply on indoor pcb
    faulty indoor pcb transformer
    burnt fuse and znr on indoor pcb
    faulty wire from indoor unit to remote control

    hope it helps

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