Hi
We have a problem with the central heating. I think we have narrowed it down to the motorised valve which is a Myson 3-Port valve.
The problem is that although we have hot water the heating doesn't come on unless you use the manual override lever. We can see from the lights on the actuator that the timer control is passing the right 'signals' to it, but it isn't opening the valve.
I had a look on the Myson website and it is possible to buy the 'actuator' bit seperately and its 4 screws and some simple wiring to replace which having taken the current one off to have a look I think I could manage. The alternative would be to buy a complete new valve but I understand that would require draining the system and would be beyond my capabilities and expensive to have done (a quote to replace it with a Honeywell valve is £150+VAT).
Can anyone tell me whether it would be false econonmy simply to replace the actuator - is it like replacing the disks in a car and not getting new pads at the same time for example?
Any suggestions gratefully accepted.
Thanks
Christine