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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...

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...