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Thankyou for the quick reply but I generally ' get a man in ', how do I measure the resistance and what can I do if it is scaled-up ?

My Worcester 24i overheats everytime we run hot water, even if hot tap is opened for just a couple of seconds. Run hot water - turn off - loud bangs - crackling / bubbling noise in pipes - reset switch pops up. When this happens I generally run hot tap to release all remaining hot ( very...