It is about 20 years old but works very efficiently when ON. The trouble is the pump is on constantly (24/7) and the boiler keeps firing up even when the thermostat in the hall is off and the programmer is also set to OFF for both water and heating. Consequently the radiators are on all the time, all day AND ALL NIGHT. This is costly and wonder if it is a boiler malfunction or an electrical fault with the thermostat or timer or programmer. Plumber suggests to get an electrician in or have a new boiler! Any suggestions would be gratefully received.

Wendy, June 2012

sounds like a faulty timer that is only on constant
You can manually fix in short term by switching it off at socket until you get a new timer. Puzzled why your plumber didn't do this as part of fault finding.

pedro, July 2012

One of trouble free boiler your timer is faulty or disconnect timer see what happen ,also check three port valve boiler get power via three port valve apart from this best boiler seen ok

lta, June 2012