Re: Daikin vrv 3 u0 error
Get a copy of the VRV III service manual, downloadable, and follow the U0 fault finding scheme.
Re: Daikin vrv 3 u0 error
Just had a quick look going to have to look at it again tomorrow not feeling great today hence not being able to work it out. It's weird though 17 bar high side 7 low but warm suction pipe on both compressors.
Re: Daikin vrv 3 u0 error
Vrf's will run to reach a certain pressure as recorded by the pressure transducers. Looks like yours is short because head pressure is low, poor cooling inside.
I'm guessing compressor is only running slowly, not like they are ramping up that much.
Discharge shouldn't be over 100°C.
Re: Daikin vrv 3 u0 error
If it's SOG the inverter compressor (first called) will hang around 38hz and not move.
As Brian says, print out the piping schematic and follow the heat/cold around the pipework with your hand.
There are bypass valves that can go crook which can lead to a warm suction pipe
Put it through a test routine and see what codes come up
Re: Daikin vrv 3 u0 error
Was low on gas and yeah the compressors were not ramping up one was ticking over slowly even when asking for 19c in all units. I thought it would be that if it was a expansion issue there's all sorts of weird stuff that happens. All sorted now. Didnt appear to be low standing pressure or running but neither tell you much on a vrv as they will maintain certain pressures.
Re: Daikin vrv 3 u0 error
Tiny leak from a flare nut.
Re: Daikin vrv 3 u0 error
Re: Daikin vrv 3 u0 error
Without the correct amount of refrigerant, they can't maintain certain pressures.