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Thanks - Why does it work with the cover off?

Hi all, I really would appreciate some help! As stated, my boiler is a Glowworm 18hxi. For the past 2-3 months, it has been displaying an F1 or F4 fault - nothing that a quick on/off can't reset - however, this has been getting progressively worse, almost to the point where it F4 (or F1's)...