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Thread: 12 y/o multi-split issue
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02-06-2020, 06:59 PM #1
12 y/o multi-split issue
I have a multi-split (two head) system. Been working fine for 12 years.
One of the head units is not getting hot or cold. It starts up the compressor ok.
Am I right in thinking this can't be a loss of refrigerant (otherwise both units would fail)?
I'm an electrician, not an AC guy, so I am wondering if this is something I can fix before I call someone out.
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02-06-2020, 07:46 PM #2
Re: 12 y/o multi-split issue
difficult to diagnose on a forum as we would need pressures and temperatures to point us in the right direction.
it may help if you posted make and model as some brands have inbuilt issues
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02-06-2020, 07:59 PM #3
Re: 12 y/o multi-split issue
Check the eev coil. Swap the two and see if that fixes the faulty unit.
More info can be provided if necessary.
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02-06-2020, 07:59 PM #4
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02-06-2020, 08:21 PM #5
Re: 12 y/o multi-split issue
Only manual I can find is an owner's one- tells me nothing.
The top pipe and 3rd pipe down are the liquid lines. Open cover and trace those pipes till they come to a valve with an electric coil on top, swap those coils over incl where they plug on the PCB.
Hopefully your unit will start working.
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02-06-2020, 08:31 PM #6
Re: 12 y/o multi-split issue
Thank you.
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02-06-2020, 09:21 PM #7
Re: 12 y/o multi-split issue
This thing? How do I take it off. I see a bolt on the front.
AC4.jpg
EDIT: Actually, searching for that part, it's coming up as a 4 Way reversing valve. There are two of them. You can just see the other in the background, top right, the other way round.Last edited by Tanaka; 02-06-2020 at 09:45 PM.
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02-06-2020, 10:13 PM #8
Re: 12 y/o multi-split issue
Looking at the data plate and the fact you say there are two reversing valves then I'd imagine there are two separate refrigeration circuits. If that's the case and guessing you can't check any pressures then get the faulty circuit only set to run and see if there's any power to the compressor or any pressure switches open circuit for starters.
Cheers,
Andy.
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02-06-2020, 10:25 PM #9
Re: 12 y/o multi-split issue
Yes, two compressors in there. It's dark now. I'll probe about with a meter tomorrow.
Thanks.
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03-06-2020, 08:30 AM #10
Re: 12 y/o multi-split issue
Thanks for your input Andy,
Sounds like someone is going to need some gauges.
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03-06-2020, 10:07 PM #11
Re: 12 y/o multi-split issue
Cheers, they might well need them!
Not that I've ever seen one in the flesh but a previous job I had at a wholesaler, we had a few calls on similar Fujitsu systems.
These 2 compressor systems were still dogging on, half in some cases. Typically units with faulty compressors were the ones where you had to take the working one out to get the faulty one out.
Despite being two completely separate systems the common PCB wouldn't let you use one on heating whilst the other was coming. Shame, a heat recovery split would have been a first!
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04-06-2020, 05:17 PM #12
Re: 12 y/o multi-split issue
I fixed it.
Bad capacitor. There were two Toshiba compressors inside. The smaller one fired right up with a new cap.
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05-06-2020, 12:09 AM #13
Re: 12 y/o multi-split issue
Glad you've sorted it and thanks for letting us know.
Brian - Newton Abbot, Devon, UK
Retired March 2015