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What causes the build up of carbon deposits at the inlet side of the gas valve (i.e. upstream of the mesh filter)? Is it a symptom of a problem somewhere or merely a regular service requirement? If the latter, how often should it need to be done? TIA Tony B

Hi, First post - please be gentle.. I have a Myson Apollo 50/65B boiler. I can get the pilot light to stay on, but the burner will only light if I short the overheat stat out. This is even from a completely cold start, so I am guessing that the stat itself is faulty. So long as the...