honeywell wireless programmer and Vaillant boiler

[yacine]

Hi, this is my first time on here!
I have previously wired a Honeywell CM927 wireless programmer to my Baxi duo boiler and it's brilliant.

I'm now having trouble trying to get another Honeywell CM927 wired up to a Vallaint duoTEC 824 boiler for a family member.
I wired the unit to the boiler but it doesn't control the boiler...but it does connect to the wireless room unit.
Any tips or advice please?
Thanks, Yacine.

 

[WHPES]

Check your wiring again - follow each loop and connection in the circuit in turn, and look out for any potential variations in wire colour to the normal ones.

 

[yacine]

Thanks for your reply. I'm back there tomorrow so will check all wiring again. I thought they may be incompatible but after reading Honeywell details online this isn't so.

 

[yacine]

I phoned Vallaint and they advised that the ebus terminals are only compatible with Vallaint products. I was advised to take the loop wiring out of 2 terminals and wire the Honeywell to these. All working now!!