Carrier Infinity Control thermostat (vintage Sept. 2008, model SYSTXCCUID01-B) refuses to turn off a newly installed Carrier (Aprilaire 800) Steam Humidifier. The humidifier works remarkably well. It provided humidity up to 40%+ in a matter of several hours and performs all functions discussed in the manual. The two HUM terminals in the Carrier heat pump furnace are connected to the corresponding two Humidistat terminals in the humidifier. The Infinity programming features seem straight forward. Any ideas what I may be missing? It didn't properly control the earlier old Aprilaire 440 evaporative bypass humidifier. Faulty circuit board? Or improper installation?
source https://hvac-talk.com/vbb/showthread.php?2226736-Infinity-Control-won-t-Turn-Off-Steam-Humidifier&goto=newpost
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