Daikin VRV 2 (R410A) RXYQ 16 and 12

Hi guys I replaced both inverter compressors and on master unit RXYQ9M inverter board and PCB because varistor burned . After put new R410 A 33 Kg an set new PCB on master RXYQ9M unit done test but test wont finish ... after 1 hour push return button and system start but showed me U9 error on indoor BRC controller what do you thing what else is faulty Q1 and Q2 is connected Ok do i have something wrong with deepswitches setting DS3 or anything else is wrong ? ???? please help whats to do ....




Thank You .

F1f2 comms to indoors q1q2 comms between outdoors

Sure F1F2 from master to Indoors and Q1Q2 from master 16 to slave 12 but it dosnt start anyway ... :(

U9 means there is a comms error but it's not that unit. You could try a hard reset and see if it runs and then see which indoor doesn't..Fix the fault then do another hard reset to get it back on line..

How to do hard reset turn power off for while ... ?

have you checked one of your indoor units has not been switched off at isolator

As you have replaced a PCB you must do a hard restart. Press and hold the outdoor reset button for 10 seconds on the Master CU

if the hard reset doesnt work check on the outdoor board how many indoors,bs boxes the outdoor can see, if it cant see all the indoor kit then its gonna alarm again- then check spurs are on and green flashing led's on indoor pcbs

Thank U guys I will do it cheers !!!!!