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Thanks CBW. I have bought a Honeywell 2-port for speed, but will use the Sunvic as a spare if your suggestions work. Thanks for that. diode84

Hello I am having problems finding a replacement Actuator or an equivalent for a Sunvic Mo Mo SMZ 1801. They don't seem to produce them any more. The Danfoss HPA2 look similar. Any advise appreciated. Thanks diode84

Yes good idea but will have to wait till I drain the system to add more rads.

I did tighten it but there is still a very small leak and didn't dare tighten it any more as it looks a cheap brass drain tap. Any idea if its the one with 'o' rings or the cheap one?

I think I have found it, the drain tap at the bottom of the boiler had a drip on it. I tightened it.

Hello I have an intermittent leak in my Grant Vortex Pro 15/21 inside the case. Never very much water but the bottom of the case has sometimes 3mm of water. I have checked the flow and return connections but can't find any leak. The boiler is about five years old. Has anyone any ideas what may...

No relays in wiring centre. I have ordered a Honeywell valve from Screwfix, I hope they are genuine, I pick it up tomorrow. I will look at its instructions and modify the wiring as needed. Thank you everyone for the help, I know I will be back in the future. diode84

Hello My first post so hello everyone. I put in my home system a few years ago and used Sunvic mo-mo motorised valves. The second one is leaking from the seal where the motor rotates the valve. Can anyone recommend the best non leak motorised two way valve that will last a long time. It does...