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Well, it took all day but I figured it out. Don't know how it happened, but the demand control on the boiler was set to thermostat - which I assumed was correct, but it actually needed to be set to"wiring centre". I don't understand how the wiring centre option works, but everything working as...

Thanks. I did wonder about that. So the valve has 5 wires, live, neutral, earth, grey and orange. Live neutral and earth are all connected to the relevant connectors but but orange and grey are cut and disconnected. This is by design, the original installer has tapped over the ends of these...

Hello and thanks for any help. I have a Navien system boiler configured as S Plan. Everything has been working fine for 2 years until the other day when the boiler no longer fires for DHW only. CH works fine and the valve on the DHW circuit also operates correctly. I am still able to get...

Actually, now it think of it, this solves my other problem too. Wow, good old PTFE tape.

Just gave that a go, worked a treat. I knew there was a simple answer! Many thanks St0rmer66. Now onto my other problem, will start a new topic for that though.

Hello, First time poster, many time reader. I'm installing a new shower, concealed thermostatic variety. I have a brass wall mounted elbow with a female 1/2 inch thread into which the shower arm screws. Looks like one of these...