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Thanks for the advice Matt, this is what I wanted to do at first (i.e. installing a different valve which would allow me to get rid of this relay wiring centre) however I did not feel comfortable doing so as I did not know where the wires were going to. Since I now have the wiring diagram...

Could not do any work on it on Friday, so I spent quite a lot of time working on it on Saturday, for some reason having a freezing flat for a few days in a row makes you move your bum :lol: Was doing several things at one though. It seems that the aperture on port B is slightly bigger than on...

I recently had to replace a Sunvic MK1453 3 port valve, at first I thought I reinstalled the 3 port valve and the actuator exactly the same way as they were originally installed. Since the valve did not come with any instructions, I used the writing on the plate of the front of the valve for the...

To be honest the valve did not look healthy to me: I managed to remove the stuck nuts using a gas blow torch. I reinstalled the 3 port valve and the actuator exactly the same way as they were originally installed. My central heating is working fine (so far). However I am not sure about...

The PCB of the RJ2802 Relay Wiring box was well damaged, numerous tracks were blown away: This part is pretty hard to get hold off (very low stock) hence very expensive (one company quoted me £108!). I contacted Sunvic (their factory is 20 min from my place) who told me they still had a...

Would do that but then I bypass the fuse... instead I will first remove the circuit board from its unit, clean the track between pin 8 and the fuse (which I suspect has blown away) and bridge it with a wire. I just hope no other components got damaged... will update this thread shortly. Thanks...

Thanks Mark, the 5A fuse is a brand new one which I have just installed. The problem is that before being a 5A fuse, the previous guy installed a 13A fuse. Therefore I suspect this 13A fuse did not protect the board from the outage which is now damaged, however it would be great if someone...

I have found an even clearer wiring diagram online, still available on the Sunvic web site (http://www.sunvic.co.uk/rjtypicalprog.pdf). My junction box seem to be actually called a Relay Junction Box RJ 2802. I get a voltage of 240V between pins 6 and 8, but no reading between 6 and 19...

Latest status: I have now received both the DM5601 actuator & MK1453 valve. I drained the system to replace the MK1453 valve but was not able to do so, I have only managed to remove one of the nut after using some MD40, the 2 other nuts are still stuck so I think I will need to wait a bit...

Hi guys, Sorry for the crappy photo, the cylinder and valve are located in a tiny closet, hence not really convenient to take pictures. Indeed it is definitely a 3 port valve, MK1453 is actually written on the valve. I called Sunvic and was told I could replace both the DM5601 Actuator &...