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  1. #1
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    Fujitsu Split Unt Wallmount Inverter 2.5HP


    Dear All,

    I have checked out this split unit, it is a ASAA24JCC
    A 2.5HP INVERTER WALLMOUNT.

    It has been newly installed few months back, but hardly used as the house is being renovated etc.
    when the unit is turned on, the unit just blinks 2 times - timer LED

    That means serial reverse transfer error, ussualy a problem with the PCBs indoor or outdoor, or supply to the PCBs.

    I have checked all, everything seems to be fine.
    Checkd the Outdoor fan, expansion valve, PCBs replaced yet the same blinks!

    Any idea what could it be ? Do you think the installation not done correctly as in vacuuming and gassing up ?




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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    check ur interconnecting cable-especially on the indoor spur- ensure nothing is crossed otherwise
    sales@fgeurofred.co.ukService & Warranty Enquiries: service@fgeurofred.co.uk
    FG Eurofred Limited (Sales Office)
    Unit 150
    Centennial Park
    Centennial Avenue
    Elstree
    Hertfordshire
    WD6 3SG
    England
    Phone: +44 (0)20 8731 3450

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Quote Originally Posted by install monkey View Post
    check ur interconnecting cable-especially on the indoor spur- ensure nothing is crossed otherwise
    sales@fgeurofred.co.ukService & Warranty Enquiries: service@fgeurofred.co.uk
    FG Eurofred Limited (Sales Office)
    Unit 150
    Centennial Park
    Centennial Avenue
    Elstree
    Hertfordshire
    WD6 3SG
    England
    Phone: +44 (0)20 8731 3450
    That's a real handy address for someone in Malaysia

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    nothing like a long distance technical helpline to put u on hold for a while!!
    Quote Originally Posted by r.bartlett View Post
    That's a real handy address for someone in Malaysia

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Quote Originally Posted by install monkey View Post
    nothing like a long distance technical helpline to put u on hold for a while!!
    i guess it's just reversing the trend...

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Quote Originally Posted by r.bartlett View Post
    i guess it's just reversing the trend...
    LOL.... reversin the trend...!
    well I'd check the bridge wires linkin indoor / outdoor already...

    I was wondering if the pipes were not vacuumd proper, cud it cause such probs for inverter units...

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Serial reverse error means indoor unit getting no comms from outdoor unit.

    This is normally due to the outdoor not powering up fully due to faulty PCB or outdoor unit electrical load such as fan motor, 4 way valve, ACTPM etc. This can be confirmed by no comms voltage (interconnect neutral and 3 50-100V DC)

    Look for the 2 orange wires if your model has them listed that go to the Posistor. This is an anti-surge device that will open up if something is taking to much current. In normal operation it will pass a small current, PCB's will liven up and switch a relay across the posistor so more current will flow.

    Power the unit down, wait at least 2 minutes to allow the capacitors to discharge (measure voltage across P and N on inverter board or voltage between red and black wires on fan motor. Otherwise you'll unplug the fan motor and it will spark across and blow the PCB and maybe the fan motor as well. Yep - done it myself!

    Disconnect fan, eev, 4 way valve, power back up, see if you have comms voltage between neutral and terminal 3 of interconnect 50-100V AC.
    If so power down, wait for capacitors to discharge, plug 1 component back and redo the procedure.

    To test the fan motor with it unplugged measure resistance between black and red (340V DC input) when unplugged and between black and the wire next to it (15v DC to power internal PCB of motor). If they read low resistance then motor down.

    Normal problem is fan motor faulty causing PCB not to liven up and initiate comms.

    I don't think your model has the orange wires for the posistor as it's built onto the board but you'll have to check. If the components don't provide any clues then there maybe another fault with one of the other outdoor PCB's if they are seperate. If so let me knopw and I'll find a diagram if possible to see which way to go.

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

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Quote Originally Posted by Tayters View Post
    Serial reverse error means indoor unit getting no comms from outdoor unit.

    This is normally due to the outdoor not powering up fully due to faulty PCB or outdoor unit electrical load such as fan motor, 4 way valve, ACTPM etc. This can be confirmed by no comms voltage (interconnect neutral and 3 50-100V DC)
    ~ When you say interconnect neutral, you mean using a multimeter/tester to check values, correct ?


    Look for the 2 orange wires if your model has them listed that go to the Posistor. This is an anti-surge device that will open up if something is taking to much current. In normal operation it will pass a small current, PCB's will liven up and switch a relay across the posistor so more current will flow.
    ~ I believe my model does have the two orange wires, the posistor could be built on the pcb it self, (a wiring diagram will be shown)

    Power the unit down, wait at least 2 minutes to allow the capacitors to discharge (measure voltage across P and N on inverter board or voltage between red and black wires on fan motor. Otherwise you'll unplug the fan motor and it will spark across and blow the PCB and maybe the fan motor as well. Yep - done it myself!
    ~ P is Live is that correct? So measure across Live and Neutral to determine if supply is shut before unpluggin the fan motor.


    Disconnect fan, eev, 4 way valve, power back up, see if you have comms voltage between neutral and terminal 3 of interconnect 50-100V AC.
    If so power down, wait for capacitors to discharge, plug 1 component back and redo the procedure.
    ~ Ok i understand this part, remove components and check without them and then start pluggin component back 1 at a time and re check, the value from neutral and 3 on multimeter should show a swing value usually between 30V to 130V is that right ?


    To test the fan motor with it unplugged measure resistance between black and red (340V DC input) when unplugged and between black and the wire next to it (15v DC to power internal PCB of motor). If they read low resistance then motor down.
    ~ from the service manual i have the resistance value on testing fan motor. I wil also paste a copy of this info.

    Normal problem is fan motor faulty causing PCB not to liven up and initiate comms.

    I don't think your model has the orange wires for the posistor as it's built onto the board but you'll have to check. If the components don't provide any clues then there maybe another fault with one of the other outdoor PCB's if they are seperate. If so let me knopw and I'll find a diagram if possible to see which way to go.
    ~ I have only one outdoor PCB in this model, Let me get the diagrams. Will repost in an hour.
    Thanks alot bud.



    Cheers,
    Andy.
    Firstly, thanks andy...thats was rather detail and I am going to give that a shot since Im outta ideas.
    my replies are in quote coloured blue~

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP


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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Quote Originally Posted by rashVRF View Post
    Serial reverse error means indoor unit getting no comms from outdoor unit.

    This is normally due to the outdoor not powering up fully due to faulty PCB or outdoor unit electrical load such as fan motor, 4 way valve, ACTPM etc. This can be confirmed by no comms voltage (interconnect neutral and 3 50-100V DC)
    ~ When you say interconnect neutral, you mean using a multimeter/tester to check values, correct ?
    ~
    Yes, use a multimeter. The neutral and comms on the interconnect (Terminal 2 - I've checked a diagram now, terminal 2 is neutral, comms is terminal 3)

    Look for the 2 orange wires if your model has them listed that go to the Posistor. This is an anti-surge device that will open up if something is taking to much current. In normal operation it will pass a small current, PCB's will liven up and switch a relay across the posistor so more current will flow.
    ~ I believe my model does have the two orange wires, the posistor could be built on the pcb it self, (a wiring diagram will be shown)
    ~I've checked a diagram and the posistor is part of the board and on the neutral side. On yours there is 1 orange wire which carries the neutral from the last part of the PCB (Bridge Rectifier) on W6, then hops across on the orange wire to W5, into the posistor then to neutral. It's near the centre of the PCB slightly away from the heatsink side of things. The PCB is upside down so easy to check voltage and things are labled up quite well. If you can see it, the posistor is marked as R1 on the soldered side of the board.

    Power the unit down, wait at least 2 minutes to allow the capacitors to discharge (measure voltage apcross P and N on inverter board or voltage between red and black wires on fan motor. Otherwise you'll unplug the fan motor and it will spark across and blow the PCB and maybe the fan motor as well. Yep - done it myself!
    ~ P is Live is that correct? So measure across Live and Neutral to determine if supply is shut before unpluggin the fan motor.
    ~You will need to check on the DC part of the circuit. P is a 340V DC feed. It comes from the AC supply being rectified then used to power inverter and fan motor. On the PCB, look where the compressor wires go to. As these go to the PCB the connect to U, V and W on the inverter chip. Either side of these joints are the P and N - Positive and Negative 340V DC supply.

    Disconnect fan, eev, 4 way valve, power back up, see if you have comms voltage between neutral and terminal 3 of interconnect 50-100V AC.
    If so power down, wait for capacitors to discharge, plug 1 component back and redo the procedure.
    ~ Ok i understand this part, remove components and check without them and then start pluggin component back 1 at a time and re check, the value from neutral and 3 on multimeter should show a swing value usually between 30V to 130V is that right ?
    ~That's it!
    To test the fan motor with it unplugged measure resistance between black and red (340V DC input) when unplugged and between black and the wire next to it (15v DC to power internal PCB of motor). If they read low resistance then motor down.
    ~ from the service manual i have the resistance value on testing fan motor. I wil also paste a copy of this info.
    ~The motors have a PCB built into them. They take a 340V DC supply and use this to work their own inverter circuit on the internal PCB. There is also a 15V DC supply to power the PCB, a signal speed input and output. A fan motor from the future!
    Normal problem is fan motor faulty causing PCB not to liven up and initiate comms.

    I don't think your model has the orange wires for the posistor as it's built onto the board but you'll have to check. If the components don't provide any clues then there maybe another fault with one of the other outdoor PCB's if they are seperate. If so let me knopw and I'll find a diagram if possible to see which way to go.
    ~ I have only one outdoor PCB in this model, Let me get the diagrams. Will repost in an hour.
    Thanks alot bud.





    Firstly, thanks andy...thats was rather detail and I am going to give that a shot since Im outta ideas.
    my replies are in quote coloured blue~
    I've pasted and added the red bits.

    Hope it helps!

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

  11. #11
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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Quote Originally Posted by Tayters View Post
    I've pasted and added the red bits.

    Hope it helps!

    Cheers,
    Andy.

    Im going to give this diagnose method a shot today.... will update after.

    cheeers bud!

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Quote Originally Posted by install monkey View Post
    check ur interconnecting cable-especially on the indoor spur- ensure nothing is crossed otherwise
    An important point made by there. If in doubt wire direct from the outdoor to indoor so you don't go through any isolators or pump high level switches.

    As a rule the units should be wired direct to each other. Depending on your region and interpretation of the rules, if an isolator is used indoors then it shouldn't switch the comms cable as the poles in the switch can sometimes have a bad enough connection to disrupt the signal. As the comms signal is referenced to neutral then the same applies to the negative cable as well.

    In practice I've only ever seen the comms connected straight through and live and neutral switched. Seems to work fine but important to bear the neutral cable in mind when checking out comms faults on splits.

    Best avoid using the high level switch on pumps to break the comms signal. Either use it to switch a third party alarm or if the switch and it's cabling is capable of taking the current, wire the 240V feed to the indoor unit through it instead but make sure it's well marked up on the indoor unit to save any confusion if the switch breaks contact.

    Cheers,
    Andy.
    Last edited by Tayters; 09-04-2012 at 12:23 AM. Reason: Wired up my float switch wrong.
    Health and safety first..........unless I'm in a hurry.

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Quote Originally Posted by Tayters View Post
    I've pasted and added the red bits.

    Hope it helps!

    Cheers,
    Andy.

    Ive tried it, Measure the N and 3 while everything is plugged in, i got a readin of 30V to 70V AC on multimeter.
    then first thing i tried was with the outdoor fan motor plugged out, turned on power and just before i tried it , the unit started up... the indoor was on "test run" i guess it took about 2 ~ 3 mins before i came with the multimeter and realised the outdoor compressor started running...

    I still measured it with the outdoor fan motor unplugged, and got swing value approx almostttt the same... hmmm... anyhow, im quite certain the outdoor fan motor needs a replacing and maybe the outdoor pcb (incase the terminals or dv volt part to outdoor fan motor is bust)

    how was my judgement ? rookie enough ? hehe..

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    If the unit was powered off and on from the main isolator before the testing this would have cleared the fault code assuming worse case it was intermittant and had just stayed out on the fault code.
    If it faulted straight away when power was turned back on (I guess it was as in the first post you say the PCB was replaced) but only fired into life once the fan motor was disconnected then it's a fair chance that is where your fault lies.

    If you fancy testing the fan motor then there a couple of tests you can do from this thread: http://www.refrigeration-engineer.com/forums/showthread.php?15069-Fujitsu-General-Fault&highlight=posistor post 59. Credit goes to Ozairman

    Also if you search 'posistor' you will find some info on them on this site which might explain further the PCB operation. Took me a while to digest it all but makes sense and is easier to troubleshoot than you might imagine.

    Cheers,
    Andy (still a Rookie myself!)
    Last edited by Tayters; 10-04-2012 at 11:08 PM. Reason: Full stop in the wrong. place
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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    What is the difference between


    Serial signal (reverse) error, at operation start up
    Serial signal (reverse) error, during oeration

    Serial signal (forward) error, at operation start up
    Serial signal (forward) error, during operation


    Im not very sure which is from indoor to outdoor , and from outdoor to indoor etc.

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Reverse: Indoor can't see the outdoor

    Forward: Outdoor can't see the indoor
    Health and safety first..........unless I'm in a hurry.

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    bud...hope you dont mind im going on asking question here... I tot i might aswell since ur previous technique did
    teach me quite a bit!

    I recently came across a casette unit that was faulty. (split unit)
    AUYF24LAL CASETTE 2.5HP INVERTER SPLIT UNIT.

    indoor:
    operation: 5 blinks
    timer: 2 blinks

    error: IPM protection.

    This was the error, how do i go about checkin it, from the service manual it says check for bad connection etc, check PCb and lastly if still bad just replace outdoor PCB.

    some dude did replace the outdoor PCB but the error was the same, he then replaced the indoor PCB and still no changes ~ same error...

    I was wondering if you had somemore tips for me on how to go about diagnosing this prob?

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Follow this post for checking the inverter:
    http://www.refrigeration-engineer.co...ht=#post251273


    Seeing as the outdoor board was replaced (not sure how many there are though) could be that the compressor was seized, had a winding open circuit or possibly wired up incorrectly and spinning the wrong way (unlikely but still worth checking).
    Can't see the indoor PCB at fault causing an outdoor inverter problem.

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

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    all these was pretty cool.

    now lets say, ive done checking the INV/Outdoor PCB. its fine, perfectly receives an indoor signal etc etc.
    No problem with the compressor windings/readings etc/ and none of the outdoor components plugged into the outdoor pcb seems to be the problem ..... if this is the case, how could we go about checking the strainer and 4 way valve to see if those buggers are clogged or some sort ?

    it'l be quite a waste to release the gas each time we need to check those...

    I cant seem to see a problem, when i last checked the casette unit previously mentioned...
    after replacing a brand new pcb, the unit runs for a few hours and again blinks in error, this time 3 blinks.

  20. #20
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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    test reversing valve-

    1. Disable the condenser motor; while the system is operating, allow the head pressure to rise until it will not go any higher or the pressure reaches 475 lb, whichever occurs first. Remember, if you are working in heating mode, the condenser motor is the indoor motor.
    2. Turn the system off. This quiets the machine and disables the fans so you can listen and feel for the problem. Also, the increased pressures developed during this test intensify the symptoms, making them easier to detect. If the reversing valve is energized during this test, you will have to “hot wire” it prior to running this test so that it will not de-energize when you turn the machine off.
    3. At this point you might be able to hear a hissing noise from the source of the hot gas bypass. If you are still not sure which of the two components is leaking, place one hand on the compressor dome or the suction line as it enters the compressor, and the other hand on the suction line as it exits the reversing valve. One end of the line or the other will probably get much hotter, much faster.
    If the compressor end gets very hot very fast, the compressor is at fault. If the reversing valve gets very hot very fast, the problem is the reversing valve. If you still cannot determine which is the problem, it most likely is the compressor, because the location where you touch the compressor is removed from the source of the hot gas. On the other hand, the location where you touch the reversing valve is very near where the hot gas will be bleeding through. So if the compressor is bleeding, you may not be able to tell easily, but if the reversing valve is bleeding, you will have no doubt.
    source achr news
    test drier- measure temperature at inlet and outlet- if when running theres a temp difference of over 1 deg then it will req changing
    https://rapidshare.com/files/2567025..._-_Service.pdf;
    auy24 service manual

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    Quote Originally Posted by install monkey View Post
    test reversing valve-

    1. Disable the condenser motor; while the system is operating, allow the head pressure to rise until it will not go any higher or the pressure reaches 475 lb, whichever occurs first. Remember, if you are working in heating mode, the condenser motor is the indoor motor.
    2. Turn the system off. This quiets the machine and disables the fans so you can listen and feel for the problem. Also, the increased pressures developed during this test intensify the symptoms, making them easier to detect. If the reversing valve is energized during this test, you will have to “hot wire” it prior to running this test so that it will not de-energize when you turn the machine off.
    3. At this point you might be able to hear a hissing noise from the source of the hot gas bypass. If you are still not sure which of the two components is leaking, place one hand on the compressor dome or the suction line as it enters the compressor, and the other hand on the suction line as it exits the reversing valve. One end of the line or the other will probably get much hotter, much faster.
    If the compressor end gets very hot very fast, the compressor is at fault. If the reversing valve gets very hot very fast, the problem is the reversing valve. If you still cannot determine which is the problem, it most likely is the compressor, because the location where you touch the compressor is removed from the source of the hot gas. On the other hand, the location where you touch the reversing valve is very near where the hot gas will be bleeding through. So if the compressor is bleeding, you may not be able to tell easily, but if the reversing valve is bleeding, you will have no doubt.
    source achr news
    test drier- measure temperature at inlet and outlet- if when running theres a temp difference of over 1 deg then it will req changing
    https://rapidshare.com/files/2567025..._-_Service.pdf;
    auy24 service manual

    thank you...pretty in depth, im gonna read through getr a copy of the copy and prehaps try it out if i get a chance... only one thing though, i gotta find out how to use the reverse cycle for heating, as here in msia its hot, and the ACs are for cooling... cud be some DIP switch i'd have to toggle...

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    Re: Fujitsu Split Unt Wallmount Inverter 2.5HP

    should be a test button on the remote- run in cooling for as long as possible to get the room temp as low as possible.
    set for 30heat then push the recessed test button-and hopefully it should run

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