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  1. #1
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    testing S1 voltage at condensor then it went bang



    Mitsubishi IND slim

    Split system with 2 indoor cassettes.

    Put my probes across S1 and the earth next to it from the 230v supply.
    I was under the understanding that S1 was 208v-240v so was stunned when it went bang.

    It blew a 6.5v fuse in the condenser board, replaced the fuse but now got e6 error and only 12v between S2 and S3

    My question is, should it have blown between S1 and earth?

    Tony



  2. #2
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    Re: testing S1 voltage at condensor then it went bang

    Quote Originally Posted by teejay711 View Post
    Mitsubishi IND slim

    Split system with 2 indoor cassettes.

    Put my probes across S1 and the earth next to it from the 230v supply.
    I was under the understanding that S1 was 208v-240v so was stunned when it went bang.

    It blew a 6.5v fuse in the condenser board, replaced the fuse but now got e6 error and only 12v between S2 and S3

    My question is, should it have blown between S1 and earth?

    Tony
    This tells me that you either have a dodgy meter or it was not on the correct setting

  3. #3
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    Re: testing S1 voltage at condensor then it went bang

    was ur probe on the screw or on the end where the wire goes in, maybe arced s1 to casing
    e6 is comms error- check the size of the fuse that went bang- if it was over 6 amp u fried the board, disconnect the s1 s2 s3 on the outdoor unit ,power up outdoor and test the terminals carefully
    - as frank said if u had a crap meter and had the probes in the wrong holes- i ve had it with them lil **** meters at climate ctr-everytime i test a ballast on a light fitting-handy as pins are tiny-pop- new ballast
    get ur boss to buy u fused test leads with 3mm visible contact area- health and safety requirement for live testing, and maybe some more company underpants!

  4. #4
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    Re: testing S1 voltage at condensor then it went bang

    This is possible
    I have a cheap multi meter that I use just to take temperatures but today forgot me fluke which will gave a AC or dc reading. The setting was at AC.
    Can I ask, if usually taking a reading across S1 to earth is this OK as it totally stunned me.

    I expected a reading of 240v
    TJ

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    Re: testing S1 voltage at condensor then it went bang

    yep it blew the 6.5 fuse in the board.
    The system was ok so guess im paying for a new board then.

    Tj

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    Re: testing S1 voltage at condensor then it went bang

    with a fluke t5 or t1000 its fine - as it wont trip an rcd circuit- other brands can cause trips- found this at me peril when working on petrol station fridges- pop-all the tills,pumps,lottery machine, silence!!! haha

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    Thumbs up Re: testing S1 voltage at condensor then it went bang

    ALL,

    The fault was the PCB, I changed it today, hey presto......
    So what went wrong so nobody else does what I did. £218 later.....

    I originally tested S2 to S3 on A/C, with a multimeter, I later under stand this to be 24v DC, so at this point I think I broke the multimeter although it still gave me a reading.

    Next I went straight to S1 to earth terminal, normally this would be OK but I think at this point I had broke the tester....... BANG.

    Go get a new board at £218

    Massive thanks to those who replied.

    TJ

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    Re: testing S1 voltage at condensor then it went bang


  9. #9
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    hookster is offline Veteran Poster I am starting to push the Mods: of RE
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    Re: testing S1 voltage at condensor then it went bang

    Even a crap meter should not short on 24v!! The shunt resistor should easily handle your test.
    I love the smell of Ammonia in the morning!

  10. #10
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    Re: testing S1 voltage at condensor then it went bang

    maybe user error! or shaky hand syndrome!
    Quote Originally Posted by hookster View Post
    Even a crap meter should not short on 24v!! The shunt resistor should easily handle your test.

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