the boiler has just been serviced working well. howver the same fault has occurred. the boiler runs switched off. the pump casing seems very hot and the boiler lights for a few seconds and then goes out. I have noticed the tap water is very hot. I have rebooted at the mains electric. no change. this morning after service is was working right.

John Lett, September 2009

dhw flow switch may be stuck on.

Ian, September 2009