Daikin VRV2 L8 fault

[sgge888]

Hi guys
I have been to a system this week which was not running. I started up and system seemed to run fine but have attended next morning to find L8 fault which I understand to be a compressor issue. I reset again and same result following morning, L8 fault present. when now reset slave condensor runs but nothing on master, compressor starts but then stops.
ran a test mode and got UF??

system is as follows
REYQ14M8W1B MASTER
REYQ16M8W1B SLAVE

APPROX 9 INDOOR UNITS

cant phone technical from site of condensers, is it just a faulty main/inverter compressor??
any tips appreciated, thanks.

[frank]

L8

Inverter compressor over-current

Abnormal high pressor increase due to blockage of the refrigerant circuit and others.
Defective compressor.

UF

Mis-match of piping and wiring

Improper connection indoor/outdoor and outdoor/outdoor units feed wiring

[sgge888]

REYQ14M8W1B is maste unit which is lowest HP unit, is that ok???

I have taken off panels to start looking and obviously someone has looked before as all jackets are open. There are 3 motors left to right one (larger) with oil return. I havent dealt with these loads, am I correct that the INV comp is (to the left) connected with oil return and cables from compressor go through to INV board behind main board and connect on X11a??

[frank]

The inverter compressor is normally on the left and, as you say, connects to the inverter pcb.

Have you carried out an insulation test on the pot/pots.

Are the F1 F2 cables terminated correctly?

[nigne2011]

hi, outdoor comp. overload, motor disconnected.

daikin fault codes