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I am awaiting an engineer coming but wanted to get a handle on the actual problem before paying out loads of ££££££. Which is why I'm asking for help.

Hi all, I have an Ideal isar HE30 boiler which keeps switching itself off with LF fault. I have already replaced the flame detection electrode and spark generator assembly with no luck so far, it's not overheating either. It's now making quite loud banging noises at certain times (not in...