When i put on the central heating, it works perfectly for approximately the frst half hour (i.e the radiators heat up as normal). After approx half an hour, the radiators start to cool down. When this happens i have noticed that the boiler is still on (i.e. the fan & pump are working) but the burner goes off. The burner does not come back on by itself. To get the radiators working again i have to switch the boiler to 'off' position first, then on the 'on' position.

Shubido, November 2007

Thank you for the advice 'Random Man'

Shubido, December 2007

I'd try changing the ignition box on it, i have a sime super 4 that did the same thing and is a v common fault. don't rely on switching on and off all the time as you'll put ware on the pcb board and these are v expensive to replace - do it before winter gets proper cold!!

random man, December 2007