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Mr "Gas Man" - can I thank you for your speedy reply. I will ask an engineer to look at the potential cause as you describe.

Timer set to "Water Only - Twice a day". Boiler turns on but it appear thermostat does not work and the boiler "trips out", Red light comes on. Reset, same thing happens. Two separate engineers called, changed pump and two parts inside boiler (Thermostat I think). Problem solved - but after...