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Thread: daikin error code UH
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12-01-2015, 03:22 AM #1
daikin error code UH
Dear all,
Pls give me a solution for this,
I found UH error code on one fcu and A5 error code on another fcu. Both are connected to the same CU.(4mks80E)
I have checked these things.
Indoor outdoor compatiblity.
Indoor outoor wiring and copper piping.
Pls help me to figure out this issue.
Is it pcb faullt fault.
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13-01-2015, 11:01 PM #2
Re: daikin error code UH
I think the A5 is a thermistor fault and uh is I wiring/ pcb with outdoor
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14-01-2015, 07:58 PM #3
Re: daikin error code UH
A5 Operation halt due to the freeze protection function or high pressure control
U4 Signal transmission error (between indoor and outdoor units)
UH Improperconnection of
transmission
wiring between
outdoor and
outdoor unit
outside control
adaptorLast edited by install monkey; 14-01-2015 at 08:04 PM.
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14-01-2015, 07:59 PM #4
Re: daikin error code UH
lev's on outdoor are prone to sticking
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14-01-2015, 08:03 PM #5
Re: daikin error code UH
https://drive.google.com/file/d/0Bz6...ew?usp=sharing
service manual
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14-01-2015, 08:03 PM #6
Re: daikin error code UH
From memory, Brian_UK had one of these faults a few years back - I think it's something to do with VAM'S.
There again, I am probably wrong
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14-01-2015, 08:28 PM #7
Re: daikin error code UH
test cables are correct 1.2.3 corresponds with indoor 123 and check pipework isnt crossed ie unit A is piped to ports A and wired at port A terminals
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15-01-2015, 11:14 AM #8
Re: daikin error code UH
If it's a system I've not seen before I will always carry out a wiring error check. Use SW3 on exterior service monitor PCB. This will confirm as Install Monkey as above.
I've had UH a couple of times and it was a EEV coil each time. The EEV with a faulty coil does not shut and allows refrigerant to pass through an interior unit that is not in operation.en boca cerrada no entran moscas