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I’ve attached a few extra photos, there is a spur of the feed from the boiler into the hot water tank that bypasses the MPV. He has an open isolation valve on it should this be open? You can see it as the back of the photos

No it’s not been moved, the boiler has been in since I bought the bought house 5 years ago, but I have a feeling it was changed about 2 years before purchase. The mid point valve should closing off with the CH or HW circuit, but I haven’t managed to isolate one at a time.

So I’m trying to get my head round this. I can’t see where it’s wired wrong. The red at the top of the junction box comes from T1 on the control panel downstairs, that’s is linked to the grey from the MPV, on the other side that’s linked to the blue of the cylinder thermostat which is (3 on the...

There’s no other junction box, the wiring has been replaced like for like, the only change has been the removal of the room wall thermostat and the required change to that. It has they same issue with the old Thermostat and control panel so I believe that it has always been wired in wrong.

Photo attached, top left wire is from the pump, one out the bottom is the tank thermostat, black is the 3 port. Then the three wires to the side that aren’t connected are the old room thermostat that is now redundant. I’ve also added the control panel wiring, this is the old one I replaced but...

Photo of the set up, I’m starting to think it’s the way it’s plumbed in.

Hello, I’m hoping that someone might be able to help with an issue that’s driving me mad. I have a conventional boiler set up with a hot water tank. For as long as I can remember when the hot water heater is on at the thermostat, the central heating also comes on. I’ve recent upgraded to a...