What does AHU-X11 mean?
Supply air temperature is drifting above or below its setpoint by more than the tolerance.
Why does it matter?
When SAT doesn't track setpoint, every downstream zone is being delivered air at the wrong temperature — VAV boxes will respond by opening to weird positions to compensate, masking the underlying SAT issue.
What should you do?
Check whether either coil is saturated (running this rule together with valve_saturation usually clinches the diagnosis). Verify the SAT sensor isn't in a turbulent or stratified location.
How Energy Agent prices a finding
Written by Pelorus Engineering · Brent Waluzak, P.E. (FL), President, Pelorus EngineeringLast updated