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I have read through everything. For now, I'm going to try and change like for like on the broken one to make sure it works. The thermostat that is working isn't wired to terminals 2 and 3, so I have no idea how it is.working (switching off demand). Unless terminals 1 or 4 are equivalent to 2.

Not so far :)

Thank you for your messages. I'll digest them properly tonight. There are three valves as described above. The working thermostat doesn't have any connection to number 2, so it's a mystery how it is working....

Yes, both Robus rrf10. Wiring is shown in the pictures above. The thermostat that works - i.e. pump and boiler off when turning down - (the one not broken in the pictures above) doesn't have wiring to 2... The thermostat that is physically broken (shown in pictures above) does have wiring...

Is anyone able to help with explaining the existing thermostat wiring? Thank you

Thanks. I appreciate it doesn't make sense. More photos attached showing HW and CH valves off pump, the extra valve, the wire connection for the extra valve (it doesn't use the orange), the mess of the wiring centre, and the potterton controller. The heating does work to all radiators /...

On investigation the broken thermostat controls a valve which comes after the first CH valve...i.e. the first one (covering all heating) has to be on for the second (covering top floor) to receive hot water. I don't understand any of it but it may help someone understand the wiring? Thanks Phil

Hi I have moved to a new house. One of the thermostats is broken. It's an s plan system with two zones. Both thermostats are wired differently (!). I cannot work out the wiring. I expect one to be neutral, one to be live in and one to be switched live out. But they go to different...