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Replacing old Honeywell T40 Thermostat with Tado

Postby Aaronsoup » Tue Nov 17, 2015 7:33 pm

Hi there,

I'm trying to replace an old Honeywell T40 thermostat with a Tado.

Slightly confused by the change in labels on the two thermostats and can't seem to get it to work.

I have a basic combi boiler with no control box or anything, which was hooked up to a Honeywell T40 with three wires in this configuration:


The wiring diagram for the new thermostat looks like this:


Can anyone put me out of my misery?
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Simply Build It

Postby Andywb » Sun Jan 03, 2016 10:23 am

Did you solve this as I have the same issue and wiring configuration in the Honeywell thermostat?
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