the said boiler fires up no problem when i get home from work.swich power on and boiler.then when it the thermostate switches it off.it wont fire up.have to switch power off and boiler off,wait till morning then it comes on as normal when switched on.then again wont fire up later.does anyone know what the problem could be

vince bellamy, October 2012

Temp sensor is faulty ,change NTC ,pull out temp control nob and spray WD40 any dirty may clear.

ltd, October 2012