Daikin UE error code

[Dave clark]

Hi

I was hoping that someone could help me.

I have 5 Daikin VRV 111 systems I look after in a building and system 3 is showing a UE fault on the touch screen centralised controller.
I looked up the fault and it says that the centralised controller has lost communication to a fan coil
All 8 indoor units are in error, there are no local controllers on this system and I’ve been to site and it looks like all bs boxes and fan coils have power.
I checked the power from centralised controller terminals on condenser and I appeared to have 16v Dc from this
These terminals are linked to all the other 4 condensers so I did expect this.

Just wondering though could this be a pcb issue in condenser or is there something else that I could check. ?

We will bring a local controller to site when there next as this could help
I’m back there on Thursday and it’s a nightmare trying to get through to Daikin Tech, I was on hold for one hour the other day

Really appreciate any advice you guys could give.

Thanks
Dave.

[Tayters]

Probably something happened on the outdoor causing it to lose communication with the rest of the system.
Faulty compressor tripping breaker in my experience.

Cheers, Andy.

[Stretch79]

Try a hard reset on the system.

Turn off all of the fan coils via the MCB's and turn off the condenser.

Leave it a few minutes.

Turn on the fan coil unit MCB's then within 1 minute turn on the condenser and let it go through its motions