Had a problem with an Ideal Mini C28 today. With CH 'ON' on the timclock, buner alight, apply DHW demand, the burner would go out (presumably to initiate DHW delivery at a higher burner rate) but the burner does not kick in (div valve moves etc, just no burner). Turn off DHW demand, burner comes on for CH. Turn CH 'OFF' on the time clock, apply DHW demand, burner comes on fine and supplies hot water a-go-go. Flow rate fine. Simply doesn't want to supply DHW when CH is on??!! I called Ideal Tech (yes, I was desperate), but they had no clue and are sending an Ideal engineer out later this week as the boiler is still under warranty. This means however, that I am unlikely to ever find the cause of the problem. Anybody come across these symptoms before and know the solution?
TIA, Angus.