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littlespark

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A neighbour asked me to connect up a Hive wireless controller.
Seemed easy enough, it uses the same standard back plate and connections. Straight swap there… and disconnected the wires going to the room stat, and linked through in the wiring centre.

That was before I went on holiday, and now she says the heating only works when water is on.

I’m going back to have a look, and I really should have taken photographs. The outgoing lines from the controller (x2) are as they were.

Plumbing side, it’s a system boiler, hot water tank and a mid port valve. I’m guessing the valve is stopping mid point when it should be fully over to heating only.

The outgoing lines on the controller plate are N, L, 1, 2, 3, 4….
What should they be connected to?
I’ll check when I go back


It might be as simple as being the wrong outputs needing swapped, (heating and hot water) but if so…. The old controller must never have worked properly either…. I didn’t actually disconnect anything from the plate.
 
its a duel channel Hive, which replaces a duel channel programmer....

i see terminal 3 changes function between the two diagrams... so i'll look there first..... and use 3 and 4 for the outputs.

It was a straight swap... so i dont know how its wrong now, but wasnt before?
 
well thats just damn confusing....
Certainly is!!

And another thing .......... On the old Hive receiver the relay common is a separate terminal, whereas on the new Hive presumably the relay common is connected to the live supply L.

If L and 1 were linked at the backplate (or linked somewhere) you can ignore the following comment, but if not, the original wiring might have been regarding terminals 1 and 3 effectively as 'volt free' contacts for heating and wiring them in some weird way (eg the 'wrong way round' with 3 being permanently live and 1 going to the wiring centre as the 'Heating On' signal!
Highly unlikely, but if this had been done it would mean 3 is permanently live and result in Hot Water still being heated when the new Hive says off!
 

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