Following on from a problem with a sticking micro switch, the pilot light went out on my Potterton Puma 80.

I have re lit the pilot light but when I turn the system from standby to on the burners fire up even though the heating is off. It then runs for a short period before it shuts itself down.

Can anyone answer why the burners are coming on and what I need to do to stop this problem. Also what do I need to do to resolve the issue of the boiler shutting itself down.

Thanks for your help.

Humphers, April 2009

spindle on hot water swich worn same problem as the old ascot water heater needs new switch when switch is striped down you will see signs of wear on one side

steve b&h, April 2009

with the cover off check the light at the top right of the circuit board is off this tells u if there is a no demand 4 water check for dripping taps can keep water on

jamie, April 2009