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Result, my research paid off. The common (brown) and request for heat (red) of the cylinder stat plugged directly into the CYL x2 ports on the VR65 control box has worked. Stat now responds correctly and all working :-)

I've fitted a new VR65 into my system to make the most of my vaillant ecotech plus 415 boiler, but cant fathom how I connect up my existing cylinder thermostat to the VR65. I have 3 cables from my thermostat (4 including the earth) But the VR65 only has 2 ports for the Cylinder wiring...

okay hopefully someone else can help on this front. Thanks for everything else Alec. I think I'm going to try connecting up the common (brown) wire and the request for heat (red) wire to the VR65 and see if it works. If not I think I'll have to supply the common stat with 230v supply and...

Okay thanks If I was to connect up my old switchmaster cylinder stat though, can you guide me through the connections to the VR56 and or any other connections required?

so long as the boiler has the water temp cut off at 80c as a fail safe then this is ok to use? Only I was concerned if the VR10 sensor came away from the cylinder then there was no failsafe? Any recommendations on where on the cylinder to place this? Guessing the VR10 is connected to the...

yeah sure I get that thanks, i'm going to use just the cylinder thermostat, but what 2 wires from the cylinder thermostat do i connect to the Vr65 CYL ports?

Yeah the other 2 are marked as CYL...but they dont illude to exactly what 2 cables from the cylinder thermostat are required?

Thanks Alec, Ok, so that makes sense why the change of temperature...I think I'd like to reduce that 80c temperature with the d codes then, any ideas any Vaillant boffs out there? I must have the thermostat wired wrong though as I even set it to as low as 40c so as to kick the system into...

Okay, having just seen a post regarding my actual thermostat, I'm thinking I may have chosen the wrong 2 wires to connect to the Vr65..can anyone confirm? //www.diynot.com/forums/viewtopic.php?p=2913981#2913981 I have this very same existing thermostat that i'm trying to wire up to my...

I have this very same existing thermostat that i'm trying to wire up to my new Vaillant VR65 Control Center. (To enable me to use the eBus system on my exisitng EcoTech plus 415 boiler) The control center only has 2 ports for the CYL thermostat control...on and off. I think I may have connected...

Thanks for your reply Alec, but it never got this hot before? but then I used to have the water temperature set to 15degress on the boiler with the old programmer and I guess the cylinder thermostat did the work last time?...did use to take a while to heat though. the only new thing is the...

Hi, After quite some research I decided to upgrade from my ancient switchmaster 805 programmer after having a new Vaillant ecotech plus 415 boiler installed a couple of years ago. So I've gone down the Vaillant route with the following: VR65 Control Center VR392 Room Programmer I've kept...