Help Installing

@Dawnwhite welome. Tado will give you wiring instructions whom you start the installation. For users on the community site you need to fully describe your system for users to help you.

@wateroakley is right. Your boiler is controlled digitally and you will need detailed instructions. Tado has a duty to give you that.
It is important to write to Tado Sales and ask them to send precise instructions. Do let them know if you have zone valves in your home, a hot water tank, under floor heating and it it is a large home.
If you have problems implementing that guide come back here and we will pitch in.

When you write 'old receiver, is this the Greenstar old receiver, or a Tado one, or one made by someone else? This is important @Dawnwhite - because the boiler's digital control wiring and set up menu has to be reassigned in the same step. This link identifies the installation guide: Greenstar 25-30 Si Compact ErP Installation and Servicing Instructions | Worcester Bosch. On pages 29-32 the wiring is set out for different modes. It is clear that there is a configuration panel built into the boiler which helps inform it how you intend to control it.

Now, not trying to duck - it is really important that we dont cause a fault on your boiler's motherboard, or mislead its CPU, or it could be forced into a fault. What specific model of receiver is it -and does it handle the thermostat duties, or is the entire programming function operating through that receiver?

Yes. According to that product's installation guide (Honeywell Home BDR91 Wireless Relay Box Installation Guide) it is a basic wireless interface in which the base unit operates as a dumb, on-off, relay based command station for the boiler, whilst the portable station serves as the thermostat.

It does not instruct your boiler in digital mode. This suggests, if you want to complete the conversion to digital mode:

1. Power down everything on a warm day. Double check. Take photographs of how the wiring was set before and after each step below, so if something goes wrong you can still have a warm home.
2. Disconnect the BDR91 and using the Greenstar's installation instructions ensure that the boiler's start up wiring is restored to its original state. There are often small bridging wires which need to be inserted to make sure the boiler does not listen to the dumb switched side of its control panel and is open to watching its digital triggers.
3. The redo the boiler's control wiring - that installation manual needs careful reading.
4. Using the instructions given by Tado, and nobody else's input, configure your Tado kit to operate in E-BUS D17, digital mode.
5. Go to the boiler's control panel, reading the installation guide and where appropriaste update the boiler's settings to ensure it does listen to its digital control feeds.
6. Stop and double check everything. Make sure you've got the logic straight. Also make sure you have a strategy to undo all your changes swiftly.
7. Make sure that your app recognises all the components. Turn on the power. Make sure the thermostats are registering temperature - and use the thermostats to force power from the boiler. Does it work? If not, return all the wiring to where it was and contact tado support informing them there is no heat - this will force them to prioritise your case. If their advice makes no sense, come back here.