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The heating position on the programmer sends a live to the room stat. Turning off the heating setting on the programmer shows no live to the room stat. Turning it back shows a live at the stat. Every wire works as it should. I have disconnected each one and re-connected them in isolation to...

It will be something simple. The wiring is as the honeywell diagram , and all the other diagrams I've printed off the 'net. :cry:

Orange & Grey are connected as you say. The room stat only has 2 wires (plus earth). Red input and a black output. The Black output is connected to white on the valve. I am sure the wiring is OK :? . The valve will not move to energise Orange to bring the heating mode on. I have re-wired...

Ok here's what's happening. Heating only - White & Grey live, Orange NOT! (Orange won't energise 'till the motor has turned to operate the micro switch) Water only - White live, Orange live, Grey not. water & heating - White live, Orange live, Grey not. By the way - moving the lever to...

The blue neutral is powered, the input from the room thermostat (white) has power when the stat is turned up. All the other wires (Grey water staisfied, Orange output to boiler) seem to be fuctioning as they should. How can I wire the valve so that it is forced to motor open to check it?

Hi there. I have a y-plan heating system and have replaced the mid position honeywell V4073 valve for a Horstmann (new from Screwfix). After swapping the wires over one at a time, like for like, the new valve doesn't power up. It always stays in the sprung position. I have checked the function...