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It moved it over completely to Heating of the 3-port valve. I was getting the 37V during this period on both the white heating cable and the orange hot water cable. Apologies, I didn't take a measurement of it without the white cable connected. I believe I had it set on 0, I think this was...

Yes I suspect it is faulty, but potentially only on the heating circuitry? It's very noisy, almost like a small rusty bearing spinning, I've never heard a circuit board be so noisy. I'm surprised that the led light shines green on it. Yes the valve will move over to W when I request hot water...

I disconnected them at the other end unfortunately, at the Honeywell wiring box, and then use that to rewire it for the VR66. Hi RandomGrinch, Yeah I reconnected the jumper for the 24V RT, I also tried it without the jumper but didn't observe a change. It has the correct polarity, but I...

Hi Stuckinarut, I removed the Honeywell thermostat wires as the VSmart has a wireless room thermostat. I then followed the instructions of the VR66 manual to install it. This includes the Honeywell cylinder thermostat and Drayton 3 way valve.

I have a Vaillant 418 boiler in a Y plan reconfiguration. I have just replaced the Honeywell thermostat and controller with a VSmart and VR66 system. Unfortunately I can't get the heating to turn on, but the hot water seems to run fine. I am getting a S30 No heat demand Controller status, but...