Pump on continuously - new contoller required??

[stevensn]

System:
Ideal Classic FF 250 with Sealed System kit, Honeywell C21 programmer and 2 inline valves (CH + HW).

Have just moved and found that heating did not work - diagnosed and needing a new pump so have replaced.

Everything is now working but the pump does not switch off even when the CH & HW is set to off on the programmer.

Any ideas? Do I need a new programmer? Suspect that the old pump may have had the same problem which may have knackered it in the first place.

As the Honeywell C21 has been discontinued, I understand that the honywell ST6400C can be used without rewiring i.e. same backplate. Am I correct?

 

[twgas]

do the motorized valves close when the programmer is set to off?

 

[nickso]

more likely one of the zone valves is stuck on.

 

[gas4you]

IF you are happy testing live 240V electrics, then check for 240V at each orange wire off the valves. The live one is the faulty one.

 

[ollski]

It's probably the hot water valve, even in this weather you would probably spot your rads on 24/7

 

[bengasman]

or it was wired up wrong, would not be the first case