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Having looked more closely at "WhatsApp Image 2023-02-01 at 14.15.05.jpeg" The connections are/were #1 link to #6 plus another red ?? #2 black to Salus plus another black ?? #3 live to boiler and incoming live #4 blue to Salus plus blue to boiler and incoming neutral #5 earth to boiler...

I had not realised the Salus was built into the front of the boiler. Anyway, to ensure we are all on the same page. The boiler terminal strip has 7 connections. If you number them 1-7 going left to right can you indicate which of the Salus ports went to which terminal block connection. It's...

The Salus has 4 connections 1/N - Neutral 2/L - Live 3 - Comm 4 - Normally open They transfer over to Wiser (or Hive) 1-channel as 1/N -> Wiser N 2/L -> Wiser L 3(Comm) to Wiser 1 4(NO) to Wiser 3 nothing between L & 1 on Wiser

You can verify the Wiser by just connecting L & N to the back plate, leaving 1& 3 unoccuppied. Then perform your setup, add schedules, etc. OK, it won't actually control the boiler but will allow you to see if the hub switches on or off. Did you take a picture of the Salus wiring prior to...

The Wiser installation instructions are not very clear for a 1-channel installation. Often a Combi boiler will have voltage free switching which I suspect is your situation. In your case the function of the 1-channel Wiser hub is to "join" terminals 1 & 3 together when on and "disconnect" when...

The link between L & 1 would only be required if there was a similar link on the Salus. Do you have a picture of your Salus wiring. Note your comment "Power needs to be put on to terminal 1 either by linking from L or a sperate supply", that's the grey wire for your system which is the separate...

Excellent. Thanks for the feedback

From BDR91 to single channel Hive L -> L N -> N A -> 1 B -> 3 As you have no links between terminals on the BDR91 there should be none on Hive. You may have seen comments in other posts to link L & 1 on Hive, in your case that should NOT be done. I would recommend you tidy up the loose...

Good to hear it's working ok.

Yes, you are good to continue. Make sure you carefully mark the cpc (yellow/green) core to indicate it's being used as switched live. If you know the location of other end of the cable that should also receive a brown sleeve. You don't want someone in the future thinking it's an earth connection.

Just to confirm the white cable in both pictures is one and the same? In re-checking the pictures the colours look slightly different. You are replacing the EPH by Wiser in an identical location? If not please advise prior to any rewiring.

From the EPH to Wiser.. L -> L N -> N 3 -> 3 L-2(Com) link -> L-1(Com) link no connections in 2 or 4 on Wiser. Your error was attaching the previously sleeved core to the earth terminal rather than terminal 3. You should replace the sleeving on the green/yellow core to indicate it's not an...

I believe the underlying issue is that Wiser does not have an option for the HW to come on whenever CH is selected. With a C-Plan system, the boiler is fired up when the HW comes on and the pump starts when CH comes on. The EP2002 requires HW to be on whenever CH is on. With Wiser the demand for...

I don't believe Drayton Wiser supports a gravity HW system. My understanding is that the HW and CH both need to be pumped on Wiser. Hive does have an option for gravity HW systems which basically means the HW comes on whenever CH is selected.

if you think about it, the T6360B thermostat is simply a temperature controlled switch. You only have two active wires connected to the thermostat, they are either open (heating off) or closed (heating on) when the programmer permits. The order of A or B on the T4 does not matter as it's just...

If the T6360B is starting the boiler that implies the cable is OK, so probably no need for my original suggestion. Your T4 could be faulty. Do you have a multi meter? As the T4 is battery powered you can check for continuity between A & B when it's scheduled to be on (time & temp). That can be...

There are not many choices for the T4, it's A & B to be connected. The older T6360B in theory should be 3 wires including a neutral in 2 as well as 1 and 3 connected. Is your T4 the non-wireless model or the wireless T4R? Not sure what you meant by "I have installed the new thermostat but as...

if you provide a picture of the current ST699 wiring we should be able to advise for the ST9400

Excellent. You did originally say 7 rather than 8 which confused me. It makes more sense now. What has happened to the connections you indicated were in 4 and 6. Now is a good time to take a picture of the status quo. It looks like you do have a set of connections matching the PDF and that...

I agree with that. However the op said N - Blue-A came from N L - Brown-B came from L 1 - Brown-C came from 7 2 - Red-D came from 4 3 - Blue-E came from 6 4 - Blue-F came from 3 There was no connection in 8 on the ST699 unless they transposed 7 & 8 in their reply. Perhaps the #6 core is the...