Explaining the BDR91 Boiler Relay LED indicators - Resideo

Learn more about the BDR91 Relay Box - In this video we explain what the different LED indicators mean.

If you are having problems binding a particular device to the BDR91 please review the links below to our related articles:

“BDR91” related articles:

Original Article - What do the BDR91 LED indicators mean?

How to bind a CM921/CM927 Programmable Thermostat to a BDR91 Relay box

How to bind a BDR91 Wireless Relay Box to the evohome controller?

How to bind the Y87RF Single Zone Thermostat to the BDR91 relay?

How to bind the DT92E Wireless Digital Room Thermostat to the BDR91 receiver?

How to bind/rebind BDR91 to CM721/CM727?


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[EastStirlingShire]

Any chance you might know how to connect such boiler to the Honeywell evohome relay box?

[tonyscott]

Okay, the thing I don't understand is the green button. Under what circumstances does it come on? For example, the re-pairing process involves the red light flashing slow and then fast but it doesn't mention the green light again. Should it come on? Should it permanently be on in correct operation? Do you have to press the button on the relay once the pairing has been done to put it back on?

[Closedgoodbye]

Is there an over ride button? I’ve got hot water but no heating. The thermostat is connecting to the br91 but it’s not firing the heating up.

[onurb.]

Are the binding and troubleshooting operations same for BDR91T as well?

[sohailraza]

If the lights are off and holding the button does nothing then is that a power issue?

[ElectricPylon]

Great video. Is it possible to have 2 receivers binded to 1 controller? I want to turn an electric radiator on and off when the heating comes on. I realise I need to add another relay.

[philliplaw]

Does anyone know how to open this up, there seem to be clasp at the bottom but it’s jammed

[jadeduran]

What happens when the lights are off but once you press the button on the right it turns green? Does that mean it is binded but the boiler doesn’t need to be on now?

[rpppdiggins]

I have sent Thermostat away to be mended as the screen is breaking up. Ever since it went the Relay has been showing a continuous red light. The boiler is in summer mode and no heating is on . can I turn the electrical connection off at the wall switch until I get the thermostat back for pairing.

[simoncherry]

Hi, the red LED on mine is flashing on about every 2 secs and then off for 2 secs yet the one wireless controller we have fires up the boiler, is there a problem somewhere?

[francesrichards]

Thank you so much for your video you saved me from calling a plumber out .

[islacuthbert]

Hello, the red light is flashing every second. What does this mean? Currently there is no connection to the thermostat but there was last winter. Thanks

[timesmanctwats]

Hi on my receiver, the green light is constantly on, but the red light is just flashing, have no heat or water, please any info would be priceless, thankyou.

[johnabiodun]

I've got solid red light and flashing green light... any ideas? Thanks

[TheMackcasper]

I have a solid red but heating and hot water is working i tried rebinding but still solid red

[wesleydevonport]

Mine keep cutting out so I have to press the button every 5 mins any ideas

[andrewbenson]

If red light is continuous, does this require calling a plumber or not?

[leegriffiths]

What if the lights appear to be working fine but the boiler doesn't fire up ?

[StevenBrick-xn]

This would be better without the dam music.