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Hi everyone, glad I found this site as i'm stuggling with this one. I'm a Corgi operative by the way. Anyway, my query is I have a customer with the above boiler and it's about 10 plus years old. It seems to work perfectly well other then every now and them it emits a loud explosive type noise. It starts up Ok in the mornings, and the noise seems to occur after reaching its temperature and shutting down then when it fires up again. An y ideas what it could be? I'd appreciate your input.