I've wired up Tado, but nothing seems to happen

[big_smile]

I previously had the following set up:

Honeywell T6360B thermostat (on Ground floor)

Bosstherm BRTMK2 (On Top Floor)

Siemens RWB9: Main unit - This controls both the Honeywell and Bosstherm as well as the hot water.

The current boiler is Patterton Suprema boiler 100L 9016

There is also a megaflow water tank.

I have now replaced it with the following:

Tado Wireless Receiver [Serial number: BP2983878400] (replaces Siemens RWB9)

Tado Wired Thermostat [Serial number: RU2742311424] (replaces Honeywell T6360B)

Tado Wired Thermostat [Serial number: RU2378127872] (replaces Bosstherm BRTMK2)

Tado internet bridge IB3910558720

Everything is set up, and the Tado app says it can control heating on both floors, and it can control the water. However, when I try to change the heating or turn the water on, nothing happens.Any one have any ideas? As I've got no hot water or heating. Thanks!

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This is the wiring for the old Honeywell T6360B thermostat:


This is the wiring for the new Tado wired thermostat that replaces the Honeywell:


This is the wiring for the old Bosstherm BRTMK2 thermostat:


This is the wiring for the new Tado wired thermostat that replaces the Bosstherm:


This is the wiring for the old Siemens RWB9:


This is the wiring for the new Tado receiver that replaces the Siemens RWB9:

 

[Deleted member 267285]

Oh my where to start?

You seem to have put earth/cpc into normally closed terminals.

You seem to have an additional black wire from original Honeywell

It’s hard to see where you have put the common on the Tado that replaces the Siemens, it looks like the wrong terminal and could have caused damage.

In the last one, you don’t have any commons at all, which should be linked from the L terminal

 

[ericmark]

I looked at Tado which seems very similar to Nest Gen 3, and noted no wires in common so clearly will do nothing.

What we have to remember before Part P often central heating was wired by plumbers who had no idea of what the regulations required, and would use earth wires as live wires. And also fail to run earth wires.

With my own system I had to work out what wires ran where, then select a system that would work with existing cables and design from scratch.

I selected Nest Gen 3 as two wires would power the thermostat and transmit all info, not that it was best for the house.

 

[Deleted member 267285]

What we have to remember before Part P often central heating was wired by plumbers who had no idea of what the regulations required, and would use earth wires as live wires. And also fail to run earth wires.

I understand that, but it looks like they were terminated in the correct earth terminals originally, it’s the OP who has done it wrong.

 

[big_smile]

Thanks for the help! I got the heating working.

The hot water however doesn't seem to work. Any ideas? Here is my updated wiring:

Tado Wireless Receiver


I don’t suppose the thermostats would have any impact on the hot water. But I have included the updated wiring:

Replacement for HoneyWell:


Replacement for Boss Therm



Thanks again for the help and patience!

 

[Deleted member 267285]

Did the RWB9 do the hot water too? It seems there’s 2 zones for heating, but no additional control?

 

[RandomGrinch]

Did the RWB9 do the hot water too? It seems there’s 2 zones for heating, but no additional control?

Seemingly so!

@big_smile - if you temporarily connect the grey wire (in HW NO), to HW COM (with the purple wire), does the hot water come on?

 

[big_smile]

Thanks for all the replies and suggestions RandomGrinch and CBW!

I got this working! The Tado comes with a wireless thermostat. Tado advised me that this wouldn't work for my house and I need two wired thermostats. However, it turns out the wireless thermostat controls the hot water.

So if anyone has this situation, you just need to do the following:
1. Set up the wireless thermostat following the instructions to pair it to the main receiver.
2. Run the test mode on the main receiver for hot water.

Once all this is done, the hot water will work. No changes to the wiring is needed.

You can then either assign the wireless thermostat to the same area as the wired thermostat. Or you can make it it's own area. As an own area, it can't control the heating, but it can show the temperature of the room it is placed in.