Hi there, All I have is basic knowledge and experience. 1, Switch main Switch Off for 5 minutes or so. restart to see if it's going to reset itself. 2. dies central heating work? if Yes, Then depending how old boiler is it could be problem with heat exchengers. if you can see it and has access to it. gently tap it with plastic handle of screw driver or piece of wood on secondary heat exchanger, hope this may help. what area you are you in?
hope all goes well
Merry Christmas
pjnumberone
pjnumberone, December 2014
