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Thanks for your reply. We never see the f22 message, or certainly haven't for a number of years, on the central heating, no. The only time we see it is when we frantically try to reset it due to the hot water not working. I'll let the engineer know though when he comes so he can check those...

We have a Vaillant combi boiler, sorry I don't know what model it is hit if that's important I can find out. It is about 5 years old. For quite a while now there's been a problem with the hot water, in that it will just decide to not work when you turn on a tap or shower. There is no error...