Heating coming on with water - but shouldn't - help

[FiveGoCheap]

I have a Baxi Solo boiler and Randall 922 providing hotwater and heating both about 13 years old.

My heating has recently started to come on at the same time as the water, even though the thermostat is turned right down and the heating is set to the off position on the controller.

Do I have a faulty controller or is it something more complicated?

Any advice would be appreciated.

Thanks

 

[seco services]

i would say you have a sticky motorised valve.

 

[FiveGoCheap]

i would say you have a sticky motorised valve.

Would the motorised Valve be a Sunvic (sorry not sure what I'm looking for)

 

[seco services]

poss should be valve just above pump

 

[FiveGoCheap]

poss should be valve just above pump

Does it have wiring to it and a laver that can be set at 'Normal Use' and 'Flushing Only' ?

Pump looks as though it's on upside down and the box I'm trying to describe is below it.

 

[seco services]

yep thats it

 

[FiveGoCheap]

yep thats it

I've taken the box off it's base plate and can now turn the valve manually. When in ether position the pump still runs. Is this correct?

 

[seco services]

yes the pump will still run if you have taken the actuator off the brass valve.
now you have proved that the brass valve is not seized. as it turns.
put the actuator back on, with programmer only calling for hw.
what is the lever on the side pointing to w m or h ?

 

[FiveGoCheap]

yes the pump will still run if you have taken the actuator off the brass valve.
now you have proved that the brass valve is not seized. as it turns.
put the actuator back on, with programmer only calling for hw.
what is the lever on the side pointing to w m or h ?

Sorry, can't see a lever on the side pointing to w m or h

But, when I turned the heating on, the motorised valve did move slightly in one direction. Then, having watched the motorised bit turning, with just the heating on, the flat part of the valve stem is almost in the horizontal position and with only the water on the flat part moves to about 45 degrees although it looks as though there is enough travel for the flat part of the stem to be almoast vertical.

If that makes any sense at all

 

[seco services]

providing its all moving when heating or hw selected the actuator is working ok.
all that can be wrong now is in the bottom of the brass valve is a rubber paddle that can wear or get muck blocking the port, which stops it shutting fully, so letting water by to the port that should be closed.
so you'll need to fit a new brass valve.

has this problem only just started.

 

[FiveGoCheap]

providing its all moving when heating or hw selected the actuator is working ok.
all that can be wrong now is in the bottom of the brass valve is a rubber paddle that can wear or get muck blocking the port, which stops it shutting fully, so letting water by to the port that should be closed.
so you'll need to fit a new brass valve.

has this problem only just started.

This problem actually started some months ago, but I'm only just getting round to trying to sort it - sounds like I now need someone to fit me a new brass valve.

Many thanks for your help seco services

 

[seco services]

just check that when its all cold and you put just hw on is the heating pipe from the valve getting hot as well as the hw pipe then its letting by.