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Thread: Daikin vrv
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28-03-2013, 08:10 PM #1
Daikin vrv
We have a daikin vrv with 11 wall mounted units on we have had a problem with the outdoor boards which we have changed,plus we have done every thing what daikin technical have said to do we have checked compressor,fan motors, trasformers all ok we are now having a code of u4 still coming up which is we know as comuication problem we are still having no led lights coming up on out door board, this system is from 2005 all the indoor wall mounted units come on fans but no outdoor unit or led lights on outdoor unit can anyone help ?
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28-03-2013, 08:45 PM #2
Re: Daikin vrv
after fitting new boards did you do reset and test run from out door unit
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28-03-2013, 08:56 PM #3
Re: Daikin vrv
u4 No power is supplied to an outdoor,
BS or indoor unit (including
phase interruption).
check all ur plugs connected on the new pcb- check the glass fuses
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28-03-2013, 08:57 PM #4
Re: Daikin vrv
if vrv2 then wiring check needs to be performed too, if vrv 3 then auto charge needs to be performed too
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28-03-2013, 10:27 PM #5
Re: Daikin vrv
Check the continuity of the 2core comms wire between all units....it may have been chewed by vermin
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29-03-2013, 07:21 AM #6
Re: Daikin vrv
Hi we have done all this there is no continuity coming from the outdoor board on the 2 core comms,we have tried every thing daikin have said to do
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29-03-2013, 12:13 PM #7
Re: Daikin vrv
Questions:
What is the outdoor model number?
Is H3P light on the master PCB?
Do you have the correct Outdoor PCB (part number)?
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29-03-2013, 06:27 PM #8
Re: Daikin vrv
The model number is RXYQ 10M81B there is no h3p light on and the board is correct
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29-03-2013, 09:27 PM #9
Re: Daikin vrv
If you are checking continuity on the wiring have you confirmed that the wiring is intact on the whole f1 f2 circuit?
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30-03-2013, 02:12 PM #10
Re: Daikin vrv
Yes we checked the f1 and f2 thanks for your info
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31-03-2013, 08:31 AM #11
Re: Daikin vrv
I have been told by Daikin (not on a VRF system mind you) that on inverter driven systems the condenser fan motors have on board PCB's. On that occasion, Daikin said the U4 fault meant I had to replace both the cond. fan motors & the outdoor PCB's or else the old remaining one (motor or pcb - doesn't matter which) may well fry the new pcb / fan motor on powering up.
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31-03-2013, 02:39 PM #12
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02-04-2013, 09:55 PM #13
Re: Daikin vrv
in all indoor units between f1 f2 have 16 vdc
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05-04-2013, 11:23 AM #14
Re: Daikin vrv
Please Press for more than 5 seconds rewiring button of outdoor unit PCB.