Worcester Bosch Greenstar 25si

[toroidial]

Mine was fitted in 2011 and now it has developed a fault whereby the heating comes on and off on its own accord, even when the heating switch is turned to the off position?
Has anyone got any ideas as to what/where the fault might be?
Are there stock faults on the circuit board that could be the problem

 

[bellairaphon]

External controls? Divertor paddle possibly stuck!

Nath

 

[toroidial]

Thanks for that Nath.
Are these common faults on this or any other make of boiler?

 

[Gasguru]

The MT10 mechanical timeclocks are total rubbish...common fault is the heating staying on.

 

[toroidial]

Thanks for that gasguru.
The fault does seem to be intermittent though?

 

[ALCPlumbing]

Definitely the time clock. They are ****e.

 

[gaspro1981]

Preheat activated with a sticky or faffed diverter