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Sorted now. Vaillant have issued a bulletin on the faulty burner seal made of an unsuitable material. Mine was just starting to leak, which caused carbon deposits on the HT lead to the spark plug. When the cover was on, the spark was jumping to it instead of going through the spark plug. It only...

Its igniting ok. Its been running for 5 hours now, but as soon as I put the cover on, it shuts down.

My boiler is about 4 years old and has always worked well. Recently it has developed a fault. It starts ok, and then after a couple of minutes it shuts down with error code F1. If I switch it off for a couple of mins, it can be started again, but shuts down again after about 20 secs. I removed...