Boilermate A Class

My heating has stopped working. It happened last year around the same time and I had two heating engineers out. One who'd never dealt with Boilermates and one that had. The boiler mate engineer went over the system and the only thing we could pin it down to was the motorised valve, which for the most part was in working order. We found that by switching it on manually it would work. Eventually it started to work again on its own.

Now it's happening again and jiggling the mv toggle doesn't seem to do anything at all. Unfortunately the engineer who came last year has died so I'm a bit stuck really.

Any advice would be gratefully received.

Thanks

hi, you will need to change the valve, the motor in the valve is not working