3 way valve not working got hot water no heating help

[Nursek]

Yes, you could, but you would have to set the HW cylinder stat very high to keep the boiler firing, otherwise once the cylinder stat is satisfied then the boiler stops firing so no CH., If you are worried about a high HW temperature (children etc) then as a temporary measure you could set the boiler flow temperature to say 60C/65C. and the cylinder stat to 70C,

Ok so it's not really a long term solution then really I think

 

[Basher]

Ok so it's not really a long term solution then really I think

You could try making an offer

Myson Power head Extra 322 Actuactor | eBay

<p dir="ltr" style="margin-top:0; margin-bottom:0;">Myson power head actuator 322 new and not used but box worn</p>

www.ebay.co.uk

There are complete one's with the valve for a bit more

Or the valve separately:

Myson 22mm 3 Port Zone Diverter Valve Body Only, MDV22 | eBay

<ul><li>Myson 22mm 3 Port Zone Diverter Valve Body Only</li><li>Myson 3 port diverter valve.</li><li>22mm Compression fitting.</li><li>For use with Myson MPE322 3 Port Motorised Valve</li></ul>

www.ebay.co.uk

You need to check these are the right model - I think they are but I'm not promising!

 

[Deleted member 120897]

Not much wrong with Myson, not a terrible make, and not known afaik for high failure rate. You can get good and bad in everything and Honeywell seemed to nosedive when they changed to Resideo. You might be better investing in a multimeter or 2 pole voltage indicator. You could also try @John.g ’s method.

 

[Nursek]

With HW only selected pull the manual lever on the side of the actuator and latch it in, if both HW and rads get hot, unlatch it and then try HW & CH, if no CH then more than likely the actuator.

I finally got a chance to try this! So I tried this and with the lever set at manual HW and CH work. When I set it back to auto still HW and CH work?! Does this mean the problem is fixed? Maybe the valve for CH was jammed and now it's released? Or does this mean I've still likely got a dodgy actuator? Thanks

 

[John.g]

So, (Lever on Auto) does HW work on its own?, valve doesnt move and if HW&CH selected (roomstat turned up) does it go to mid position? anf if CH only selected does it go fully over to CH only?.