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Whiter, thanks for your reply. After about four hours of running, ie; the boiler cycling on and off as normal, the radiators gradually get cold. The room stat operates, the pump runs but the boiler will not fire, there is no power to the burner because the boiler stat remains operated. I can...

I have a four-year old system with a Potterton Statesman Utility oil-fired boiler. The boiler runs normally for around four hours from cold then refuses to fire up because the boiler thermostat remains operated. The boiler thermal trip does not operate. I have tested the thermostat and it...