they are £20 from the dealers if you can find a dealer with old stock. just get part number and search found mine as dealer old stock also try vauxhall green parts.
two pin connector illuminates led on the cover
Found out all spurious codes on the meriva down to simple battery voltage and also dirty connections before starting any diagnostics always check battery voltage
have similar fault mine turns out toi be the pressure switch located on the condensor assume like myself the a/c light and on display says it is on. Suggest code reading the system