Help changing BDR91 to Hive.

newbie910 · May 17, 2025

I have a Baxi Combi Boiler (Platinum model 7219452) and I want to replace the BDR91 with Hive. The radiator heating is not working, and the engineer informed me that the BDR91 needs to be replaced. However, since it's not covered under warranty, he advised me to do it myself, mentioning that it's easy.
I’ve opened the BDR91 and attached a picture. Can someone help identify which wires need to be connected to the Hive receiver? The existing setup has fewer wires than expected. Please suggest.

ShaunCorbs · May 17, 2025

L and n to L and n on new reciever

A to 1

B to 2

newbie910 · May 18, 2025

ShaunCorbs said:
L and n to L and n on new reciever

A to 1

B to 2

Thanks . There is also an diagram for opentherm setup , can i do that or is it only standard one which needs to be done.

ShaunCorbs · May 18, 2025

newbie910 said:
Thanks . There is also an diagram for opentherm setup , can i do that or is it only standard one which needs to be done.

Stnd

newbie910 · May 18, 2025

Many thanks.
I had another BDR91 unit, which I’ve just installed. I managed to pair it successfully, but the heating is still not starting via the controller. Hot water works as expected when demanded.
During the last visit, the engineer checked the wiring and unplugged/replugged the connections to test. I’ve been facing this issue since last month — once the heating was turned on via the controller, the boiler wouldn’t switch off unless done manually. That’s why I got another BDR91, but now the heating isn’t starting at all.
After today’s replacement and pairing, the receiver blinked with a green LED and made the usual switching sound, but the boiler still doesn’t initiate heating.
The heating via thermostat stopped working after the engineer’s last visit, and he suggested that both the controller and receiver be replaced — which is why I purchased Hive.
I’ve posted pictures of the boiler wiring for reference. Please note that I also have underfloor heating (Heatmiser), which is not working either, as it shares the same BDR91. Hopefully, the wiring isn’t the root cause.

In the meantime, I’ll proceed with the Hive installation to see if it makes any difference.