AC not turning on. 00256 fault code (G395)

[razputin]

Only had the car a few months (B8.5) and just when I needed the aircon, it wouldn't turn on

The light comes on when pressed, but goes off when released. Got the below code with VCDS.

Faulty sensor? Split wire perhaps? All/any help appreciated.

Ta.

Address 08: Auto HVAC (J255) Labels: None
Part No SW: 8K2 820 043 AH HW: 8K2 820 043 AH
Component: KLIMA 3 ZONEN H04 0122
Revision: D0000000 Serial number: 01240520130090
Coding: 342402E000
Shop #: WSC 06325 000 00000
VCID: 6FEBA3FEBEEA66667D9-803A

1 Fault Found:
00256 - A/C Pressure/Temperature Sensor (G395)
002 - Lower Limit Exceeded
Freeze Frame:
Fault Status: 01100010
Fault Priority: 2
Fault Frequency: 1
Reset counter: 90
Mileage: 40716 km
Time Indication: 0
Date: 2016.10.10
Time: 02:06:39

Freeze Frame:
Temperature: 15.0°C
Temperature: 63.0°C
Load: 0.0 %
Absolute Pres.: 0.8 bar
RPM: 800 /min
Speed: 0.0 km/h
Current: 0.000 A
Temperature: 14.0°C

 

[razputin]

Anybody??

 

[rum4mo]

As you have mentioned a possible wiring issue, I'm guessing that you have done your research - though I'd hope that the wiring possibility would have been resolved by the time that B8 became B8.5!

So, without stuffing a set of gauges on the fridge plant, the only other guess is yet another fault switch?

Guessing is really only for mugs, but the above stab in the dark might just sort things out for the price of one of the latest versions of that switch from an Audi dealership's parts dept.

 

[desertstorm]

System needs regassing. The A/C system can be damaged by running with low pressure so a minimum pressure reading is required for it to work.
Could be pressure has been lost due to a leak, stones can damage the condenser on the front. The A3 8V seems to suffer a lot with this.
Take it to an AC place and get them to check the pressure. 0.8 bar is only 12PSI .

 

[razputin]

Cheers gents. I'll get the pressure checked and take if from there.

Ta.