Honeywell Home HR91 Won’t Bind to evohome? Here’s How to Fix It

Step-by-step fix guide | Honeywell Home heating controls

Try this first — Check the AA batteries are in and that the zone is set up on the evohome controller as Resideo’s guide shows, then hold the HR91’s Binding button for 5 seconds and watch the LED: amber flashing means it is binding, and continuous green for 5 seconds means success.

This guide is for evohome owners whose Honeywell Home HR91 radiator controller won’t bind. The steps follow the evohome installation guide from Resideo, which makes Honeywell Home products.

What This Problem Means

The HR91 has no screen, so its LED and the evohome controller show how binding is going. Resideo says the LED flashes amber for up to 2 minutes while binding, and successful binding is confirmed by the LED showing continuous green for 5 seconds, with a SUCCESS message on the evohome controller.

Common Symptoms

  • The LED doesn’t show continuous green after binding
  • No SUCCESS message on the evohome controller
  • A poor result in the signal test

Safe Checks You Can Try

1. Check the batteries

Remove the top cover, open the battery clip and check the AA batteries are in, then close the clip and replace the cover.

2. Set up the controller side, then hold the Binding button for 5 seconds

First set up the controller side. For a new zone, Resideo’s evohome installation guide says to press and hold Settings for 3 seconds, press the green tick, press ADD ZONE, type a name for the zone and press the green tick, then press RADIATOR VALVE on the evohome Controller. To add a radiator controller to an existing zone, it says to press and hold Settings for 3 seconds, press the green tick, press ZONE CONFIGURATION, select the zone and press RF DEVICE BINDING. Then press the Binding button on the HR91 for 5 seconds.

3. Watch the LED

The LED flashes amber for up to 2 minutes while binding. Successful binding is confirmed by the LED showing continuous green for 5 seconds.

4. Check SUCCESS on the evohome controller

You should receive a SUCCESS message on the evohome controller. If not, go back and re-bind.

5. Allow a few minutes

Resideo says battery devices only communicate with the evohome controller every four minutes to save power.

6. Test the signal

Resideo’s evohome installation guide has you press and hold two buttons for 5 seconds, until both LEDs flash amber. Then press the tick on the evohome screen to start the test. Signal strength is shown from poor to excellent, and the test exits automatically after 10 minutes.

7. Check your evohome controller

Resideo’s UK installation guide lists the HR91 for the evohome Controller (ATC928). Its guide for the newer evohome R3 controller, published for EMEA, says the older HR92 and HR91 controllers will not work with that version of evohome controller.

HR91 LED explained

LED What it means When
Amber flashing Binding in progress For up to 2 minutes after the 5-second Binding button press
Continuous green for 5 seconds Binding successful At the end of binding
Both LEDs flashing amber Signal test mode After holding two buttons for 5 seconds

If the HR91 won’t sit on your radiator valve, see the radiator valve fitting guide.

When To Contact Support

If none of these steps fix it, contact Resideo, which makes Honeywell Home products, through Resideo’s UK site.