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  1. M

    Worcester combi 28cdi - knocking and hissing - needs reset.

    I am a first time poster here and hoping for some advice. We have an 8 year old 28CDi boiler. Occassionally, when it is turned on, either for CH or HW, I hear loud knocking noises. Then the lights would flash and the little valve on top of the boiler would emit some hissing smelly steam...
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