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Having replaced the Thermocouple already it sounds like it must be the Gas Value, but I think that this is beyond my basic skills. I'd like to confirm that it's not the thermocouple before I call for an engineer.

Hi Sparkytele, I replaced the Thermocouple with one from a Heating Supplies Company - so I think it is the correct one. Any ideas how to check?

As the subject says I am experiencing a problem with my boiler :( . When starting from cold the boiler operates for a few minutes then cuts out. After a few restarts it then stays on and work ok. In the process of identifying the fault the system has been drained (X400 and X100) used, the...