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Thanks for the sooty build up link. I am not sure that the deposits I have seen are like this, but it is difficult to tell from the picture. Blue/black colour, almost the size of large grains of rice (can't think of any other way of describing them).

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

Never been able to get more than about 23 - 24mV In the last 2 days, maximum has been around 19mV from memory, but it does seem to vary a lot, dropping down to maybe 12mV, though not quickly IYSWIM.

Main gas valve was done last May, so I trust it does not need doing again so soon. On that point, it was surprising how much carbon build up (in the incoming line filter) was in evidence (the previous valve had probably been in for 3 or 4 years). Is rapid carbon build up a symptom of...

Agreed. I just wish it would be consistent. I know the thermocouple seems extremely sensitive to outside influences. I have checked the t/c voltage and on ignition last night it was about 13mV, which was less than it normally needs (>18mV typically) for the pilot to remain lit. This has got...

Well thanks very much for the nicely insulting response to my first post. A simple yes/no would have been fine, with perhaps a statement on why not. As I have managed to change just about every single key ancillary part on this boiler over the last five years without blowing up my house...

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...