Question about Hitachi RAS-09UH Air Conditioner

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Hitachi RAS-25CHA will not work after power supply -brown outage.

Has 240 volts at supply point of indoor unit but will not operate using remote or temporary switch.I unplugged and removed all circuit boards around supply connection area of the indoor unit for testing before i found no Hitachi agents are in our area of Australia.
I am an old retired electrician, so are there some basic tests i can be assisted through on finding faulty board & where a replacement could be sourced?
Many thanks ...JC.

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  • 8 more comments 
  • jcandkate Jan 08, 2009

    Problem is:- Since we suffered a loss of voltage (a brown out) from our local Supply Authority, the only bit of activity available from the air conditioner was the green timer light flashing on & off.

    The air conditioner would not respond to any use of the remote control or temporary switch.

    Hope you can help us ...........thanks JC.

  • jcandkate Jan 09, 2009

    G/Day notsomot.Thanks for your response, we live near Bunbury so are both in the same great state.

  • jcandkate Jan 10, 2009

    G/Day again notsomot.

    After some tinkering with PCB's , i have reconnected all back into the indoor section of air cond.

    Problem seems to be that the stick relay is not functioning for whatever reason (relay coil seemed ok with multimeter).This relay is one of two that switch 240 volts from the incoming supply on to the main PCB and then the motors etc etc.

    The stick relay should bring the neutral conductor into operation while the other relay of the pair which is working ok, does the same with the active conductor.

    So the feed to the outside unit which comes off the main PCB is not supplying the 240 volts required.

    The green flashing timer light mentioned in previous text, seems to follow the sequence of 13 times on and off then a short pause of maybe 6 seconds before starting the cycle all over again ----- is this flagging our problem?

    What are your thought's?

    Cheers .........JC.

  • jcandkate Jan 11, 2009

    Greatings notsomot.

    Is there not some test that can prove conclusively a fault exists and if it is definitly on the main large PCB?

    $300.00 is a lot of money to spend if the air cond.then still may have the same problem.

    Many thanks ...JC.

  • jcandkate Jan 12, 2009

    Greatings again notsomot.

    Could you please get price & availability on the three PCB's.

    Many thanks .....................JC.

  • velcorp Jan 14, 2009

    I have exactly the same problem. Does anyone know of a hitachi agent in Penrith NSW?

  • jcandkate Jan 15, 2009

    G/Day again notsomot.

    Have you had any joy getting prices & availability on the three individual PCB's yet?

    Cheers ........JC.

  • Anonymous Feb 16, 2009

    i have the same problem too but this is the third time now. The first two times it was covered by warrenty but not now so my solution is to get rid of it

  • goosecat Feb 25, 2009

    Ok my problem is similar to a previous one regarding Hitachi Air Conditioners. I have a split system reverse cycle unit model RAS-30CHA1R/RAC-30CHA1. After having three refrigeration techs and 1 A grade Electrician look at the problem I've finally narrowed the fault to either the internal PCB or a capacitor, relay or switch between the terminal board and PCB. There is 240v power at the internal terminal board but absolutely no operating power or indicator lights showing. The unit is completely dead despite having 240v power at the terminal board.\r\n The last frigy to look at it agrred with notsomot's advice regarding the cost and availability of Hitachi boards and spares. He priced replacing the indoor boards and with labor I'm not getting much change out of $1500.00.
    It's a large 3 H/P unit that fitted will cost close to $3500.00 to replace so neither option appeals much.
    I can't believe there is no ability to repair these boards. My father in law god rest his soul was a radio tech who loved pooring over circuit boards and repairing them. He set up and built a lot of his own testing equipment and I would love to have him looking at this issue right now.
    Surely there is someone out there, recently retired or otherwise who could make a few hundred dollars by finding and repairing these types of power supply faults.
    I live in Mandurah WA and if anyone has a good suggestion as to what I can do regarding this issue, please let me know. At the moment I'm stuck between spending $1500.00 on a sven year old unit with no support (Hitachi) or spending $3500.00 on a new unit (probably Panasonic who at least have a service agent in WA).
    It's money I just don't have.

  • Thomas F. Schneider May 11, 2010

    See it their is any help here for you.



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I am an ex warrenty agent for Hitachi in Western Australia and I will be able to take you through some tests if you want. But from the sounds of it I think that you will be up for a new indoor PCB as these are the most common things to go when there are power failures. If you would like me to go through it with you let me know. But first where abouts are you in Australia?

Posted on Jan 08, 2009

  • 1 more comment 
  • Mathew F
    Mathew F Jan 09, 2009

    Im in mandurah so your just south of me, I dont think there are any more agents down your way. It use to be DMS curtin. If your power comes in from the Indoor (plug or hard wired) and you have power at the indoor and not at the outdoor you can say it would be the indoor PCB. How many interconnects does it have and what power have you got on them? I will try my best from what you tell me. But I have to warn you in advance that PCB from older Hitachi units are expense

  • Mathew F
    Mathew F Jan 10, 2009

    Heya again JC,
    It is sounding more and more like an PCB fault. The light that where blinking means comm error which is... normally PCB. Everything is pointing at the indoor PCB mate. But again I have to stress that any boards that are out of warrenty are going to be alot of dollars. If you would like me to price up a board for you I will, but I will be serprised if it is under 300 and every attemp ever made to fix these PCBs have failed.
    If your really want my advice It might be time to look at a new unit....

  • Mathew F
    Mathew F Jan 11, 2009

    Your not really going to like this answer, but Hitachi never bothered to bring out service points on any of there Aircons the only tests are the ones that we have done. If power comes in on the indoor Power board and then dose not leave to the outdoor you replace the indoor boards (normally get all three) but in all honesty alot of people choose to spend the little bit extra and get a new air con. I am sorry but thats all that anyone can do. The boards are made ridiously expensive by Hitachi so that people do the upgrade, there is next to no mark up by the refrig companies.



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