Need help with Bryant Evolution Connex thermostat replacement - no communication with outdoor unit (A/C)

[RSmoot]

Evolution Connex Thermostat Model SYSTXBBECW01 has been paired with a Bryant furnace 986TB and A/C 538A for the past 10-15 years. Lately, the temperature on the thermostat has been way off, as much as 10-15 degrees. Since the thermostats are proprietary and there was no way to purchase directly from a retailer, I ended up getting a newer Evolution Thermostat model (SYSTXBBECC01-B) off Ebay. No problems recognizing the furnace, but it will not recognize the A/C. Any suggestions?

 

[Fitter30]

Look at 5.5 in this manual. MyEvolutionconnex.Bryant.com has expired sorry. Would think there not compatible 10-15 years being that old. Electronics change at least 2-3 times a year. Looked at nos stats they price them so high they want to upgrade your whole system.

https://www.google.com/url?q=https://www.behler-young.com/UserFiles/Resource/II-SYSTXBBECC-06.pdf&sa=U&ved=2ahUKEwiMsafA3tSJAxUPjokEHYYrJx0QFnoECAkQAg&usg=AOvVaw2foVKyu9sF4oqXJfn6_E2A

 

[Sponsor]

 

[Breplum]

Sorry to hear that the newer stat is not compatible.
We installed dozens of the Evolution systems back when I was running my bigger company so it is dis-heartening to hear that there is no easy resolution.
Maybe look for a different pre-owned older Evolution model on EBAY
Would love to know if it might be that particular -B unit you have or is universally a no-options situation.
try to contact Bryant?