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Noisy combi80 boiler?

My boiler has started making loud noises after the hot water has run for just a short time.Also lockout light is on constantly.My radiators seem to heat up too.
Jack, September 2006
SEEMS LIKE A DIVERTER VALVE IF RADS ARE HEATING WITH HOT WATER. PLUS ITS OVER HEATING FOR LOCKOUT MODE TO COME ON

HI-SPEC PLUMBING, September 2006