Vaillant EcoTEC plus not working after set up

You need some help attaching the thermostat to your specific boiler. This way please !
JonAshton
Posts: 7
Joined: 16 Oct 2021, 16:32

Vaillant EcoTEC plus not working after set up

Post by JonAshton »

Hi,

I have tried to set up my Netatmo system but it fails to work. The relay works for the “test” function (e.g it blinks on starting and has a solid light when turned on) but the boiler does not start when the thermostat temp is raised to “max”.

The relay clicks and turns to a solid light but the boiler doesn’t turn on.

I asked Netatmo for advice and they advised both the black and grey wires should be inserted into the “RT” connection.

Any ideas why it’s not working (I’m assuming I’ve done something wrong!)

Thanks
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GEORGzer
Posts: 2663
Joined: 14 Jan 2014, 18:14

Re: Vaillant EcoTEC plus not working after set up

Post by GEORGzer »

You put grey and black into the same terminal, you have to put them side by side, one wire into each terminal.

If your old setup only had one wire, that’s because it got the 230V somewhere else.
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Home: Weather Station (V3 + Rain & Wind Gauge, 3 additional Indoor Modules, Shield), Valves Starter Pack + 7 Valves, Video Doorbell
Office: Thermostat (V2), Healthy Home Coach, Smoke Alarm, 2 2in1 Sensors

Not a Netatmo employee
JonAshton
Posts: 7
Joined: 16 Oct 2021, 16:32

Re: Vaillant EcoTEC plus not working after set up

Post by JonAshton »

I did ask Netatmo for advice on that specific point and that’s what they told me to do! :lol:

Before I asked them I did also try one of the wires in the adjacent terminal but nothing happened then either.
Yes, the old set up had a single wire only going onto the RT terminal.
Which terminal should I put the other wire in?

Thanks.
JonAshton
Posts: 7
Joined: 16 Oct 2021, 16:32

Re: Vaillant EcoTEC plus not working after set up

Post by JonAshton »

Sorry, just seen the big red arrows on the picture. I’ll try that again and report back!

Thanks.
GEORGzer
Posts: 2663
Joined: 14 Jan 2014, 18:14

Re: Vaillant EcoTEC plus not working after set up

Post by GEORGzer »

👍
Home: Weather Station (V3 + Rain & Wind Gauge, 3 additional Indoor Modules, Shield), Valves Starter Pack + 7 Valves, Video Doorbell
Office: Thermostat (V2), Healthy Home Coach, Smoke Alarm, 2 2in1 Sensors

Not a Netatmo employee
JonAshton
Posts: 7
Joined: 16 Oct 2021, 16:32

Re: Vaillant EcoTEC plus not working after set up

Post by JonAshton »

No, still the same I’m afraid. :cry:
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JonAshton
Posts: 7
Joined: 16 Oct 2021, 16:32

Re: Vaillant EcoTEC plus not working after set up

Post by JonAshton »

This is how it is now…
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GEORGzer
Posts: 2663
Joined: 14 Jan 2014, 18:14

Re: Vaillant EcoTEC plus not working after set up

Post by GEORGzer »

Alright, my bad. I now researched the manual and only the right terminal (marked RT) is operational. Meaning you have to connect the grey wire to the RT terminal and the black wire also to L next to the brown wire of the Netatmo Relais and the existing power supply.
But since 3 wires are a bit much for one terminal, I would suggest switching to the 24V terminals since the the Netatmo Relais can handle both high and low voltage.

Connect the black and grey wire to the white terminals on the left side of the circuit board, marked „24V RT“, located between the blue and orange terminals.
One wire into each terminal (screw), polarity doesn‘t matter.
Boiler settings stay the same like before with the old controller.


Btw. if possible disconnect the old controller entirely, since it was high voltage. Or at least put a new terminal or some sort of clamp on the old cable instead of the tape.
Home: Weather Station (V3 + Rain & Wind Gauge, 3 additional Indoor Modules, Shield), Valves Starter Pack + 7 Valves, Video Doorbell
Office: Thermostat (V2), Healthy Home Coach, Smoke Alarm, 2 2in1 Sensors

Not a Netatmo employee
JonAshton
Posts: 7
Joined: 16 Oct 2021, 16:32

Re: Vaillant EcoTEC plus not working after set up

Post by JonAshton »

Fantastic!

Thanks very much for your help.

All now working.

I’ve put the old relay wire into the non-operational terminal next to the 230v RT terminal to tidy it away. I assume that’ll be ok if it’s not operational?

Thanks again for all your help.
GEORGzer
Posts: 2663
Joined: 14 Jan 2014, 18:14

Re: Vaillant EcoTEC plus not working after set up

Post by GEORGzer »

Glad I could help 👍

Regarding the old wire, it should be ok.
If that cable is the only one running to the old controller, you could disconnect every wire of that cable. That way everything will be „dead“ for sure.
Home: Weather Station (V3 + Rain & Wind Gauge, 3 additional Indoor Modules, Shield), Valves Starter Pack + 7 Valves, Video Doorbell
Office: Thermostat (V2), Healthy Home Coach, Smoke Alarm, 2 2in1 Sensors

Not a Netatmo employee
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