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03-04-2012, 04:19 PM #1
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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03-04-2012, 10:22 PM #2
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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03-04-2012, 11:37 PM #3
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03-04-2012, 11:46 PM #4
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03-04-2012, 11:58 PM #5
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04-04-2012, 01:56 AM #6
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04-04-2012, 09:01 PM #7
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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05-04-2012, 02:25 AM #8
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05-04-2012, 03:55 AM #9
Re: Fujitsu Split Unt Wallmount Inverter 2.5HP
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05-04-2012, 02:39 PM #10
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06-04-2012, 01:42 AM #11
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08-04-2012, 08:55 PM #12
Re: Fujitsu Split Unt Wallmount Inverter 2.5HP
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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10-04-2012, 03:34 AM #13
Re: Fujitsu Split Unt Wallmount Inverter 2.5HP
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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10-04-2012, 11:06 PM #14
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
Health and safety first..........unless I'm in a hurry.
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12-04-2012, 05:11 AM #15
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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12-04-2012, 09:58 AM #16
Re: Fujitsu Split Unt Wallmount Inverter 2.5HP
Reverse: Indoor can't see the outdoor
Forward: Outdoor can't see the indoorHealth and safety first..........unless I'm in a hurry.
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17-04-2012, 03:17 PM #17
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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17-04-2012, 11:32 PM #18
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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07-05-2012, 07:53 AM #19
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.
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07-05-2012, 09:44 AM #20
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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08-05-2012, 10:35 AM #21
Re: Fujitsu Split Unt Wallmount Inverter 2.5HP
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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08-05-2012, 09:20 PM #22
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