ESI 2 Valve to Tado V3 Wireless

[MrFlip]

Hi All,

I am currently trying to get Tado V3 Wireless set up on ESI 2 Valve PCB (no hot water). I have followed several threads on here and else where but unable to get it working fully. I have managed to get it into the state in the pictures attached (1st is of the original set up) and can confirm when powered up it calls for heat and hey presto both valves open and the boiler heats the water.

The trouble is the stats didn't call for it and the boiler wont stop, I have tried my best to go through all the threads to see if I had missed anything but cant see my mistake other than buying a house with an ESI set up!

Current wiring
PCB - Receiver
0v - NO
RH - NC
L-L
N-N

Receiver Loop
L-COM

I have tried with the +V wired to NC but that did not change anything.

It has been a very long evening doing this!

Any help would be much appreciated!

 

[CountryFan]

I don't think the link is required as it looks like your existing setup uses 5v, not 230/240.

 

[Madrab]

+1 - why are you sending 240V to connections that are marked 5v or even volt free 0V? Not familiar with the ESI PCB 2 valve - is there a link to the MI?

Where does the grey in pick 3 go to, is that split to the greys in pic 2?

Were the browns in pic 1 to the +V terminal originally 240v?

 

[MrFlip]

Your right, I'm not to sure why I've linked the 230v to the COM on the receiver. I think that was from following another thread and I've forgot to unlink that.

Here is a link to the MI for the two zone valve system. https://support.esicontrols.co.uk/wp-content/uploads/2024/02/CPC2ZP6C-Installer-Instructions.pdf

The grey in pic 3 goes to one of the greys in pic two on the 0v, there is two recovers both wired up like pic 3, one for each stat. So this is linking each RH to NO

The browns in pic one are linked to the ESI Wired Stats on the wall into the +V which is only carrying 5V.

The 230v for the receivers is coming from a junction from the boiler supply to the board at the Valve end

 

[CountryFan]

I'm not entirely sure, but think you'll need all 3 somehow in the receiver. Perhaps speak to Esi technical?