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PostPosted: Mon Feb 20, 2017 1:30 pm 
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Hi All

We have been having erratic problems with out heating system of late, is there a chance we need a new Synchron motor in the valve, or worse still a valve head itself ??

One problem started a few weeks ago in that after the Hot Water had been on, it was hit and miss whether the next time the heating was needed that the boiler would fire up. When I viewed the valve when this was happening, the indicator lever was stuck somewhere between A+B (Mid) and A (Heating). I am assuming the motor couldn't wind it on far enough to the A position to hit the microswitch and just sat there. If I powered the lot down, the valve would spring back to B (Water), I could then put the heating on and the valve would go all the way to A and fire the boiler. It seems like it needed a 'run up' lol

That issue still happens occasionally, but now it seem that if the heating was the last thing to be on (but not calling for heat at the time), and the water calls for heat - then the valve does not return all the way back to port B for the Water but it hangs around the A+B position.
The outcome of all this of course is that the radiators are warming up when I don't want them to.
When this is happening, I can push the lever back against the motor manually to B position and it stays there and the rads cool down eventually

I've already had at least two motors in the valve over the last decade for similar reasons, I know they don't last forever

System is Y Plan using ACL Drayton lifestyle with newly added Nest thermostat (the first problem was there before & after this installation though)


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PostPosted: Tue Feb 21, 2017 2:49 pm 
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Sounds very much like a stiff valve and even if the synchro motor is okay it soon will get fried and not be, the only check I know would be to lift off the actuator and feel the valve, though it only moves a very small angle it should be a feather light action.
Others might advise you more.

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PostPosted: Tue Feb 21, 2017 3:02 pm 
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A new actuator and perhaps a complete valve for only a few quid more.

It sounding like a wiring error to be honest.

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