Honeywell Thermostats

[jaded1]

Hi. My CM927 has failed again, but not this time for the usual biannual display. The clock has gone to a 10 hour max?? I can't fix this and so I'm having to replace the 927. Can anyone confirm whether the Honeywell T3R or T4R will pair (bind?) with the original relay box, (BDR91)? T I A.

 

[muggles]

No, they won't - they use different firmware

 

[ianmcd]

Nope you will have to change them as a pair

 

[Deleted member 267285]

Just as an FYI - I’ve lost count of the Honeywell cm927/ones used with Intergas boilers for loss of power/display, even new ones. Complete garbage if you ask me. The T range (haven’t used myself) gets a lot of love on here.