Boiler keeps on boiling water even heating is switched off

[John.g]

The whole actuator, at least, , as its the spring return thats probably causing the problem or the end switch sticking on, remove the actuator from the valve and switch the zone valve on off with the actuator removed and see if 230v still present when switched off, also open/close the zone valve with a adjustable spanner or such on the valve spindle, it should move relatively very easily.

 

[luckyvictor]

Yes, it’s not the motor at fault, it’s a microswitch.

which/where is this microswitch please? can it be replaced on its own?

 

[luckyvictor]

The whole actuator, at least, , as its the spring return thats probably causing the problem or the end switch sticking on, remove the actuator from the valve and switch the zone valve on off with the actuator removed and see if 230v still present when switched off, also open/close the zone valve with a adjustable spanner or such on the valve spindle, it should move relatively very easily.

Would like to try, but did a search on youtube, couldn't find any tutorial of how to, basically i have no idea what the structure is.

You know any good youtube video i can follow please?

 

[Deleted member 120897]

which/where is this microswitch please? can it be replaced on its own?

It’s where the orange wire connects, but probably best to renew the actuator (valve head), some have replaced them, but I wouldn’t know how as I’ve never done it.

 

[Deleted member 120897]

Would like to try, but did a search on youtube, couldn't find any tutorial of how to, basically i have no idea what the structure is.

You know any good youtube video i can follow please?

 

[luckyvictor]

Thanks, now i know what to expect to see. will try it sometimes next week.

 

[ShaunCorbs]

Have you tested if theres 240 on the brown for the 2 port valve in the wiring centre ?

With nothing calling eg heat and hot water timers off

You won’t get the head off as there’s not enough space to lift it out need to rotate the valve so the head sticks out front time for a plumber I would say

 

[Deleted member 120897]

You won’t get the head off as there’s not enough space to lift it out need to rotate the valve so the head sticks out front time for a plumber I would say

Spoilsport!

 

[luckyvictor]

Now something I don't understand, I thought the system is actually running, but even though I boosted hot water, create demand, the boiler is not on, is always 00, I have only removed the faulty orange wire from WC, and touched absolutely nothing regarding HW, and I did see the boiler ignited yesterday for once (didn't check after), the time that I thought the system had no power.

So what is my problem now ...

When I press restart from the boiler, it doesn't seem to go through the usual start up sequence, but stays 00 all time...

 

[Deleted member 120897]

Are thermostat’s up? Could be already satisfied.