cheers, Iīll give it a go with the option codes. This is not a new install or anything. I did the install a couple of years ago and itīs worked fine ever since. The error code just suddenly started appearing. I think I may have found an indoor PCB which I can borrow to test, so I may give that ago and see if it works with that. If it does, then I will know that it is the indoor PCB that is faulty.