Motorised Valve Stuck

[diynoob]

Hi,

The motorised valve for my centrsl heating does not work. The little lever is loose, no resistance at all when moving it (ie its jammed open so the central heating will not turn off).

See picture of the inside of the valve. The lever does not engage the brass part at all. Also that brass part is jammed up against the grey plastic bit. On the other (working) valve I can see the lever moves the brass part to and fro.

Do you think its un-jammable? Not sure which bit to try turning or if the valve can be dismantled any further. If not, is if just the syncron that needs replacing in cases like this?

Thanks

 

[picasso]

Easier to just change the whole head, what make of valve is it ?

 

[diynoob]

Honeywell v4043h1056 motorized valve.

 

[ianmcd]

Just change the synchron motor, easily done and under £20 for a motor, make sure you isolate the electric supply as there is a permanent live in there

 

[picasso]

From the ops first post it sounds like the gear mechanism has jammed so little point changing the sychron motor.

 

[diynoob]

I removed the sychron and cogs sprang back into place. I have put it back on and the lever is now engaging the cogs normally. Although it does occasionally skip. I think the teeth of the cog on the sycron are worn.

 

[Agile]

Very easy to remove the motor and see if its output shaft can be turned or is jammed.

But it can also be the shaft on the valve itself jammed.

Like everything it needs further investigation.

Easiest to take head off first and see if the valve shaft moves.

If so then open the head over a bowl as the motor screw is very tiny and easily lost!

 

[diynoob]

It's working now thanks. The motor is fine. If you look in the original photo you can see that the brass arm has moved way down below its normal movement range. It shouldnt be anywhere near that grey plastic bit that it was pressing up against. So what's happened is that over time the teeth have become worn and keep slipping. So eventually that brass arm has reached a point of no return. Probably the exact same thing is going to happen again so I think I'll replace the whole unit.

 

[Agile]

You can buy replacement heads.

I usually get the rather cheaper non Honeywell ones as sold by Toolstation etc. and have had no problems with them.

 

[diynoob]

PS I watched this video which is very good: