3 port valve motor question

[tollanarama]

following on from an earlier post of mine, I've got a problem with my central heating. The hot water works lovely and I've noticed a few posts below with the same problem & taken note of the solutions.

Now, I turn on the central heating and it seems to come on.
Then there is a "Click" sound and heating goes off. looking at the 3 port valve shows that the "paddle" is in the correct place to begin with but as soon as heating is switched on the "paddle" moves out of position and turns off heating!!!

Is this a motor problem?

If so, is it easy enough to replace, and how much is one and where can I get one?

If it's not easy - what can I do & how much will it cost to repair?

Thanks
dave angel is online now Edit/Delete Message

 

[kevplumb]

try the shop

 

[tollanarama]

try the shop

Thanks - tried it, but "unavailable"!!!!

Any other ideas??

 

[kevplumb]

plumbers merchant or one of the sheds