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- 25 Dec 2004
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Im having problems with my combi boiler, it is making a loud nocking noise inside when CH is on and overheating switch cuts in within 10 seconds, tried with just HW but does the same, the gauge also jumps up and down all over the place , any ideas would be nice but as I dont know a lot about boilers ,would probably get a engineer to fix but I would like to know what the problem could be before ,,many thanks mark