Halstead Finest Gold, 9 years old, heater fires & reaches temp, then cuts out & goes to loockout once temp drops I press reset button heater fires once more. had three engineers look at it & its still the same
Thanks

Jenny Vowles, December 2010

either temperature limit stat isn't working, the gas valve isn't modulating (cutting the gas rate), the pump isn't working efficiently or there is a blockage or restriction. start with the pump when you switch on the flow from the boiler should get hot in seconds. after a while if the boiler starts making a noise the gas flame should lower if it doesn't it's either the stat or gas valve

brian, December 2010