Results 1 to 6 of 6
  1. #1
    Join Date
    Feb 2014
    Location
    Australia
    Posts
    3
    Rep Power
    0

    Changing both controller and inverter PCB assemblies



    Your assistance please.

    I was recently advised by an electrical contractor specialising in aircon that the reason my fujitsu AOTS12LDC inverter unit was not working was because the pcb needed replacing - quotes on the way! I've just looked again at the job sheet and realised the engineer/technician is looking at replacing both the controller pcb and the inverter pcb.

    My initial question is, is it usual for both to be replaced in this manner. During the visit he took the top off the indoor bedroom unit (and had a quick look in) and went outside too look at the outdoor unit (did nothing more outdoors than write serial numbers down).

    ?



  2. #2
    Join Date
    Feb 2007
    Location
    UK
    Posts
    2,479
    Rep Power
    38

    Re: Changing both controller and inverter PCB assemblies

    OK,
    Let me ask you a question.

    My car mechanic have told me that he want to change both the engine and the left rear tyre, is that normal?

    As you can see, without enough information we can all come to the strangest of conclusions.

    What is the problem with your unit?
    How old is it?
    Any fault codes?
    What is the cost for an engineer to attend your house versus the cost of the PCBs? You might find that the cost for the PCBs is less than the cost for an engineer to attend therefore if it is a communication issue it might be cheaper to replace both PCBs than to get one and then have to return on a separate occasion to replace the other...


  3. #3
    Join Date
    Apr 2008
    Location
    Southampton, England
    Age
    42
    Posts
    883
    Rep Power
    27

    Re: Changing both controller and inverter PCB assemblies

    G'day.

    In my experience the indoor PCB (controller PCB as you've called it) doesn't normally go down, more common is a comms error due to a faulty outdoor PCB and/or fan motor.
    Diagnosing that lot isn't a 5 minute job, unless you're a flying Kiwi. :-)

    Cheers,
    Andy.
    Health and safety first..........unless I'm in a hurry.

  4. #4
    Join Date
    Feb 2014
    Location
    Australia
    Posts
    3
    Rep Power
    0

    Re: Changing both controller and inverter PCB assemblies

    Valid point!
    It's a comms fault.
    just 6 years old and out of it's 5 year warranty.
    Had a quote from the firm that came out and had a look - PCBs are coming in at c$390 (indoor PCB) and $560 inverter PCB) exlusive of labour..................total $1,300 !!!

  5. #5
    Join Date
    Feb 2014
    Location
    Australia
    Posts
    3
    Rep Power
    0

    Re: Changing both controller and inverter PCB assemblies

    Hi

    Yeah its a comms fault and the firm has decided to replace both PCBs - the quote is $1300 all up (indoor PCB $400 and inverter $580 exclusive of labour..........

  6. #6
    Join Date
    Aug 2001
    Location
    Gold Coast, Australia
    Posts
    597
    Rep Power
    22

    Re: Changing both controller and inverter PCB assemblies

    You're in Oz, so there's a good chance it got Gecko'd. Or destroyed by other vermin.
    Also, it's a Fujitsu.
    The last but two that I worked on, a gecko had suicided across the inverter outputs. Once you see that, it's easy. Check the compressor is electrically ok. If so, replace the inverter card & quite likely the main card too.
    As I recall, on this occasion the boss had been the first attendee & Funitsu tech. support (henceforward FTS) reckoned it was the indoor card, which he duly replaced with no change in the fault. I got sent with an outdoor card which FTS had suggested, but the wrong one had been picked by their spares dept. So while I was there, I got onto FTS & did more diagnostics (I also had our inverter checker with me). The result of that was all outdoor cards to be replaced.
    On that unit, you couldn't see behind the IPM, so it wasn't until I went back with the new cards that the reason for the fault was found to be a gecko.
    Now, if I suspected a 'gecko fault' I'd just order all the outdoor cards & have done with it.

    I should mention that FTS are usually excellent.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •