Central Heating/Hot water Pump won't turn off

[seco services]

what about pipe to valve ?
and pipe from valve to cylinder they hot ?

 

[Jason58]

yes both very hot

 

[seco services]

i thought you said your cylinder was cold earlyer ?

getting somewhere now.
your programmer is off on both heating and hw.

have you a electric test meter or test screw driver ?

 

[Jason58]

Cylinder was cold earlier, pipes round cylinder were very hot but hot water was turned off, once turned on the cylinder gots hot.

Yes both off now. unfortunately no test meter or test screwdriver.

 

[seco services]

if you say no wiring has been changed.
but valve appears to be opening and shutting when water to temp.
but pump and boiler not shutting off.

does that sound right if yes i would say their is a fault in the electrics in the valve actuator (plastic part) and not cutting the power to pump etc.

but without a meter we can't check it.

 

[Jason58]

Yes exactly right - thank you very much for your time at least we have an idea what it might be, will get it tested.

Thanks again.

 

[seco services]

let us know the result.
good luck.

 

[larrytheleak]

seco services
with the programmer in off position for hot & heating where is pump live coming from
perhaps its from pump overrun?

 

[seco services]

poss yes or i thought it maybe coming from the perm live to the zone valve being a s plan and the microswitchs stuck so constantly feeding the pump etc live.

 

[manyaonisland]

sounds like it jammed.

on the side of the valve casing is another black lever push that in and the plastic top will lift off the brass valve.

is the plastic casing hot ?

Hello

I have the similar problem and my man/auto switch is jammed in manual position

Please let me know how to swtich it back to auto position?

Thanks for help