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Hello I've been told this switch is a fuse switch and other people have told me it's for the immersion heater, can someone confirm this? It's left on all the time and I never touch the timer thing. If it is an Immersion heater, should I turn it off and start using the timer

Hello my dad had a boiler check up today and the cap on the flue above the boiler had fell off. It's potentially been like that for a long time. Was this dangerous? We have a carbon monoxide detector but that never went off. I have posted a picture below of the little cap, the engineer...