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If your prior thermostat was wireless you should have a receiver unit which needs to be linked out then. Otherwise you have an "open circuit" and the boiler will not fire up. Can you outline all the components previously being used.

The link between L & 1 is only required on a Combi that uses 240V switching and then only with the single channel Hive. You said it's a 2-channel Hive but a Honeywell ST9100A is a single channel controller. What looks after your hot water? What sort of boiler do you have? The picture of your...

OK. Just to ensure we know which is which Thermostat A (picture 20230107_091549) which is physically ok Thermostat B (picture 20230107_104747) which is physically broken Ensure boiler power is turned off prior to making any changes, you don't want to receive a nasty shock. From what I can see...

Can you confirm the make and model of each thermostat, I suspect they are Robus RRF10's. Based on your first post, does one zone thermostat work and the other not? Can you also post pictures of the wiring for both thermostats and indicate which works or not. If they are Robus RRF10, you only...

It's specifically a smart TRV in a bathroom that I should remembered as being a problem. A regular TRV is not an issue in a bathroom unless it's used as a bypass for the heating system. In my home the bathroom & ensuite radiators heat up when either the HW or CH turns on, hence neither have a...

Your original question was related to cost saving, I suspect any remediation will be more costly overall. If the ground floor temperature is OK, the middle floor has it's TRV's set low and the top floor too cool when you retire at the moment. I'm still unclear if the top floor only has the...

Does the brown core currently loop across between righthand L & A ? If so (after turning off the power), using a terminal block (a) isolate the blue into it's own terminal (b) remove the brown loop (c) place the red & yellow cores into a common terminal That will effectively leave the...

I think we need a bit more information. You say there are 16 radiators, can you better explain how many on each floor. For example you said "the top floor is our en-suite which has two rads", is there also a bedroom on that level? Based on what you said, I assume you have a single heating zone...

Also ensure you do NOT put the link in between L & 1 (your b2 & b3) on the back plate. I would be fairly confident that whomever wired up the original Honeywell got the brown & blue the wrong way around. Can you see the other end of the 3-core cable to check. If you cannot find the other end...

The earth goes to the earth tether which is the lonely connection bottom right next to your thumb. Call that b7 in your convention. I would recommend you tidy up the cores to minimise the loose threads. You don't want them to touch each other.

My December figures are showing the setpoint reduction from 21 to 19C occuring at the scheduled time but the second reduction to 17C often happened around 50 minutes ahead of schedule. I suspect your deduction was correct. I've now simplied the schedule and switch from 21C to 17C at 22:30. I'll...

I feel there is some benefit from the variability that eco mode provides on the actual time the set point is lowered based on external temperature, etc. Turning off eco mode and moving the reduction to 17C at 10pm makes it a fixed time. Perhaps I need to do some analysis of the times the...

That is good to hear that it's all working fine. You can easily tell if its a 1-channel model by looking at the number of buttons on the right hand side. The 1 channel model has a single button labelled "Heating" whilst the 2 & 3 channel models have "Hot Water" & "Heating" buttons. They all have...

Just checking you have the 1-channel version of the Wiser. If so.. Easiest is to use the existing cable going into the purple block and connect the other end into 1 & 3 on the Wiser. Whilst it does not matter which way round the cable goes on the Wiser, I would recommend brown into 1 & blue...

Sounds like good progress. You just need to wire up the control side now and bypass current thermostat

The boiler, programmer, pump and other heating controls should be fed from a common source which is protected by a 3A fuse. Generally that would be a fused spur located near the boiler. The intent is that the entire CH system can be isolated from a single location for safety purposes. Taking...

If that's a photo of the back of the Ops Wiser Hub, it's a 2-channel version as the model number is WT724. The 1-channel would be WT714. Plus the diagram below the model number shows two sets of channel connections. When I looked at the photo I thought the "Earth" core had been taped over to...

Whilst it's stating the obvious. At the roomstat you have Blue, Red, Yellow & Earth cores in the cable but at the wiring centre you see Red, Earth and Black cores. That implies there is a junction somewhere along the link. Anyway it seems to be working so perhaps best left as is.

Is the boiler working OK at present using the Wiser? I would have expected links to L, N, 1 & 3 on the wiser back plate. Then in addition a separate 2-core cable from the opentherm module to your boiler's OT connection. That said the Wiser installation details for opentherm are not very...

Until you trace the roomstat cable back to the wiring centre you are somewhat stuck. What is strange is that the cable marked "STAT" also says "+ HW OFF". It's almost as if there is another set of connections between the roomstat & wiring centre. Hence my recommendation to identify the cables as...