Boiler problem

[berti2005]

Had a Valliant ecotec 428 fitted 6 weeks ago and suddenly it is staying on (CH/HW) regardless of whether the programmer is on and room stat is low.The only way to turn it off is to cut the power to it.
I have renewed my programmer no effect and disconnected the room stat but still the boiler runs along with the pump.
Any ideas why?

For information the system is a Y plan.

 

[D_Hailsham]

Had a Valliant ecotec 428 fitted 6 weeks ago and suddenly it is staying on (CH/HW) regardless of whether the programmer is on and room stat is low.The only way to turn it off is to cut the power to it.
I have renewed my programmer no effect and disconnected the room stat but still the boiler runs along with the pump.

Why did you not call the installer back in and get him to diagnose the cause of the problem

Why spend money on a new programmer when you didn't know (but do now ) that the programmer was at fault

 

[Kingsway]

Check that the thermostat link wire has been removed from the boiler

 

[gas4you]

IF it has only just happened then I would suspect the 3 port valve head is faulty.

Assuming this was replaced during the boiler change, then this will be under warranty as well.

 

[GasMan1965]

IF it has only just happened then I would suspect the 3 port valve head is faulty.

Assuming this was replaced during the boiler change, then this will be under warranty as well.