UK Plumber Forum

[Ozmanbroomboi]

Hi Guys,
I have a boiler that is still running even after the programmer is turned off
And the zone valve is closed it just pumps round the bypass valve
It turns on fine but it doesn’t shut off, do you think it could be programmer?

Cheers Oli

[REDSAW]

what boiler is it?

[Ozmanbroomboi]

Its ideal logic heat only

[REDSAW]

it could be & could be other things too!
need a bit more system set up info really.

do you have a drayton programmer as i find those are not that reliable on switching?

[Ozmanbroomboi]

The programmer is danfoss ive checked the wiring and that’s all fine and the heating fires up and then shuts off, its just hot water doesnt shut off, 2 port valve shuts but boiler is still calling

[REDSAW]

so, you turn on hot water boiler fires up zone valve opens and provides hot water.
you turn boiler off and 2 port closes but boiler still runs thru diverting around by-pass.
does it do this when you switch on and turn off within 10 secs of 2 port opening to be 100% sure of flow direction?
if so, its programmer
if not micro-switch in valve.

[Ozmanbroomboi]

Yeah the flow is correct, its a bit intermittent if that helps? Sometimes it shuts down the boiler other times it just calls and stays running with two port valve closed

[REDSAW]

from what your saying then the programmer is naffed- ebay £40
personally i would be going straight to zone valve and testing the micro-switch contact with a multimeter. then if all is correct inside i would buy a programmer.
if the heating valve head is the same then swap them over is worth trying then just run hot water mode.
your choice to your skills!

[Ozmanbroomboi]

Ok il give it a go thanks for the help