Hi, My boiler ha started to run continually. My only way of controlling it is to switch on or off by the wall supply spur.
I have removed programmer but still it fires up! On reading someones similar query the suggested the motorised valve may be the problem, I disconected the valve motor Ican move the actuator by hand using the manual slider so prsume valve is not clogged up, system is only 8 years old, and with the programmer still removed switched supply on and it still fires up!!!!
The only thing in the aring cupboard I haven't looked at (because don't know what it is or does) is a piece of kit with the words myson power Extra n the white plastic cover!
Anybody out ther please help!!!!!!!!

Frustrated Bill, March 2011

myson power extra is another make of two port valve either the heating or hot water valve has a stuck micro switch this is differant to the motor if switch is making all the time boiler will fire

bh heating, March 2011