Space humidity sensor failure (optional) (fa), Outdoor humidity sensor failure (optional) (fb), Space co2 sensor failure (optional) (fc) – American Standard UV05 User Manual

Page 44: Change filter indication (ff), Eprom memory indicator (ee), Configuration display (--), Troubleshooting temperature sensors, Space humidity sensor failure (optional) (fa, Outdoor humidity sensor failure (optional) (fb, Space co2 sensor failure (optional) (fc