CH not working but HW ok

petski2 · 14 May 2006

Hi all great site.(just added to my favourites)
We have a glowworm boiler thingy in the garage.
Upstairs in the airing cupboard is the cystern tank .
Last week we noticed the central heating wont work.
The hot water is fine.
After looking into it I come to the conclusion that the 3 way valve is faulty.(Landis Staefa MA-V322C.)
Now this valve has a manual lever on the bottom but I aint got a clue what moving it means.
If I pull it all the way to the left something kicks in and the pump starts working then it all goes off after about 3 mins.In this time the radiators still dont get warm.
Any ideas guys.
Thanks
Pete

HarrogateGas · 14 May 2006

Sounds potentially like the syncron motor needs replacing, the end switch seems ok. Try popping a syncron motor in the valve, they are only £10 or so to buy from any DIY shop.

petski2 · 14 May 2006

Sorry guys I must have come across sounding like I knew about plumbing but believe you me I dont.
Whats a syncron motor.

doitall · 14 May 2006

If you take the cap off the motorised valve the motor is the round silver thing that drives the valve open and shut

petski2 · 14 May 2006

Thanks mate.
Do I have this right.
When I click the CH on downstairs a message is sent to the valve to open the way for water to go to the CH.
If this is right then whats the point of the manual lever as that wont stop in any given position,all that happens is I pull it across as far as it will go and it just springs back again.
Thanks again.

doitall · 14 May 2006

That is correct there is a little catch it hooks onto.

However when you apply the power to it, it releases the manual operation

petski2 · 15 May 2006

Been out and bought synchron motor.
Problem is the old one has 3 wires going into a triangular connector.
Earth,black and white.
The new motor only has 2 wires and they are both orange.
Any idea how I can wire it up without blowing us all sky high.

petski2 · 16 May 2006

Pleeeeeeaaaasssseee help iv tried the electrics section but had no joy.

petski2 · 16 May 2006

Sorted guys.
I just wired the orange wires into the places where the black and white ones came from and all is fine.
Thanks for your help.
Cheers
Pete

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CH not working but HW ok

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