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  1. #1
    Join Date
    Jan 2005
    Location
    Ireland
    Age
    43
    Posts
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    Rep Power
    21

    Daikin my old friend



    Hi guys

    I have the following

    Indoor-------FDY P250B7V1
    Outdoor ----RYP250B7W1

    I'm wrecked and I can't remember if it wasn F1 or F2 that kept blowing , it's the one that feeds the safety devices and the indoor unit. Anyway it was popping fairly regularly when I got to site, I went through the usual, disconnected the indoor everything ok , long story short I had the unit running for 4 or 5 hours while I was doing other work, I had bypass the 2 fan thermal overloads, not best practice Sue me , I had disconnected the crankcase heater so i still had the two pressure switches and obviously the indoor connected. After running for the 5 hours I heared a loud bang, the fuse didn't just blow it blew completely out of the fuse holder and tripped the main 3 phase mcd, can anyone shed some light on what's going on here, the only thing i did notice was that the cable for the indoors was a 3 core flex at the outdoor and ended up being a shielded cable like .5 or something, maybe even less. This has been running like this for over 10 years , I didn't get much of a chance to check this out , just to say there are 3 other systems identical to this sharing the same remote, U5 faults all day when the fuse popped seemed to shut everything down any ideas ????!



  2. #2
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
    Join Date
    Mar 2001
    Location
    Dorset
    Age
    76
    Posts
    11,192
    Rep Power
    60

    Re: Daikin my old friend

    Check all the cable entries into any isolators, have the inner cable insulations been nicked when original wiring done?

    Had it before on old systems, moisture starts shorting things out.
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  3. #3
    Join Date
    Dec 2010
    Location
    ireland
    Age
    46
    Posts
    62
    Rep Power
    15

    Re: Daikin my old friend

    Previous faults I had with them units

    faulty compressor contactor

    faulty pressure switch

    outdoor pc board blown due to fan overload linked out (pull out board look behind it) and the fan blades spinning freely. The way the wires are fed into motors its a pure trap for water (cut the ties and put a trap on wires)

    a very rare one I had was indoor fan motor cable had come away and fan blade cut into it but you will have to remove blade and there's a bit of work to that

  4. #4
    Join Date
    Nov 2005
    Location
    wales
    Posts
    66
    Rep Power
    20

    Re: Daikin my old friend

    Are you saying that the interconnecting cable indoor-outdoor is 3core flex one end & SY cable the other end? Sound s like you've a cable joint hidden somewhere. I had exactly the same fault recently on a 6 year old unit blowing the fuse that feeds the indoor unit intermittently. Eventually found a joint in the cable which passed underground as it entered the building it was typically wrapped in insulting tape and was damp, causing arcing between the cores - replaced the interconnecting cable completely no joints - problem resolved..

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