Replacing wired programmer with extension kit
We think our wired programmer is broken and want to replace it with a Tado extension.
We have the Tado thermostat downstairs, a Vaillant eco Tec 831 combi boiler with a Honeywell programmer for timing heating.
The Honeywell programmer is currently wired to the boiler and to our old wired thermostat (now removed).
Should we remove the wiring for the old thermostat from the extension back box?
At the moment Tado are telling us that they don't have instructions for us to install it due to the configuration we have.