The Efficient Home Forum

Hi, I've just had an Intergas Eco RF 36 installed. I 'm trying to connect my evohome to it via an Opentherm bridge. I've connected the bridge to terminals 11 and 12 on the boiler but I can't get the bridge to bind with my Evohome. I keep getting 1 red light followed by 3 green. I've reset the bridge using the 15 seconds then 5 seconds press with the button but it still won't connect. The weird thing with the evohome is that if I try to connect to a non existent BDR91 relay that I had on my old boiler it keeps saying the binding has been successful when its impossible for it to connect to it as its lying in a box with no power going to it. I keep getting a binding successful message whenever I try to connect the Opentherm Bridge as well. I've factory reset the Evohome and also removed the batteries for half an hour but its still doing the same. Is the Evohome faulty? The model is ATC928G3000

How have you cabled the OpenTherm Bridge to the boiler? Any pictures of the wiring?

The bridge is cabled to boiler. In discussions with Honeywell just now. I sent them some videos and they agree there's an issue. They flashed the evohome with new firmware but it's still doing the same thing.

Got it sorted. I had to do a full reset of the RF unit on the boiler. Turned out the guy who installed it had tried to connect the evohome to the boilers built in RF unit even although he had been specifically asked not to do anything with the thermostat side of things. They were connected but they're not designed to work together. Once I reset the RF unit the Evohome and the Opentherm Bridge connected on the first attempt.

tricksterdude wrote:Turned out the guy who installed it had tried to connect the evohome to the boilers built in RF unit even although he had been specifically asked not to do anything with the thermostat side of things.

Yep, hence the OT bridge was fitted...

Glad you got things sorted!