My boiler does not react to my thermostat control box or the room thermostat. The heating will turn back on again and the radiators get very hot. We have fitted a new control box to no avail. The over flow from the header tank also runs when the boiler does turn off eventually, after we have shut everything down at the plug socket.

J.Davies, April 2006

my potterton is a few years old every ti me i turns the water on for the hot water it stops the heating work in ihad gas man out he tells me that its tell him there leak from a tap in the house thereare no leaks in the house is my pottrrton fitted with a water senter

tony green, November 2012

I am unsure as to what you have replaced. PCB or boiler thermostat?. my first choice would be the boiler thermostat as you can imagine it has the last say in how hot the boiler gets.

Paul, May 2006