Help with OBD Code

[JooJooBeans]

Hi guys,

I'm trying to sort out my a/c which hasn't really worked for best part of a year. About 10 months ago an Audi mechanic topped up the gas, but told me I needed a new blower fan. I couldn't afford it at the time so left it.

I just bought one off Ebay and fitted it. Now have air rushing through all the vents. Great news.

The air doesn't get cold though.

Using the climate control OBD codes I have the following fault-

22.1 (F118) A/C refrigerant high pressure switch, static open, *
*compressor remains off until switch closes.

Would really appreciate it if someone can guide me on how to proceed from here. Many thanks.

[a8 tech]

Replace trinary switch on the condensor,unless you do have high pressure test with pressure gauges,but the switch is common and will automatically turn of a/c compressor

[Jared71482]

also very possible that the system is overcharged. This will open the high pressure switch which cuts the compressor to protect it from damage.

[JooJooBeans]

Thank you both for the replies.

I've not heard it called the trinary switch before- is that the name of the part I should look for, or is it likely to be called something else?

And if the system is overcharged, then do I need a new switch, or is there an easy way to rectify the situation?

Thanks again.