To ensure proper operation of the programmable room thermostat, study user guide, presented in a convenient graphical format that contains 16 pages with useful information. You maybe able to use the "grey wire that is folded behind" for this connection, but you need to find out first what it is connected to at the other end.

Replace the wall thermostats with Tado wired thermostats so you retain the valves and the Tado thermostats are the zone controller for each zone. It is compatible with a wide range of heating systems, including combi boilers, and can be wired or used wirelessly with an RF module.OFF mode has an integral frost protection setting at minimum 5°C (installer adjustable) so that pipes in the house will never freeze in winter. Please note that this unit has 2 On/Off periods per day, compared to the 3 periods of the CM900 series Honeywell Thermostats. I found with the Energenie TRV head the anti hysteresis software was OTT, and it takes a few hours to get to set temperature, I would cheat and set two degrees higher then wanted for first hour to counter this.

You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice. In your wiring diagram on the multi channel hive, you show what looks like an internal loop between the Live terminal and the others. Bought as a direct replacement for an obsolete one that wasn’t working properly, as suggested by our heating engineer - works straight out of the box and easier to programme than our last one - should have replaced it she’s ago! You need to alter the wiring at the time clock too, you cannot just connect the wiring from the old stat as it exists as the nest runs on 12v d c and the wiring you have at the stat is 240v so you will simply blow the nest.This will reduce heat losses slightly as you'll only be pumping heat around the circuit that needs it. It's hard to see how this device could be improved, as it seems to cover most options which anyone could need to control their heating system, so I've given it 5 stars.