### Asset Description:
AHU: Air Handling Unit: A device used to condition and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system.

### Conditions:
- AHU NOT Running
- 35 °F < OAT < 70 °F
- Mixed Air Temperature > 90 °F
- Heating Drained Flag = 1 IF Reporting
- Heating Valve % = 0%

### How long the conditions were met:
Met for 3 Hours

From the given options, which one MOST likely corresponds to the observed asset behavior?
A. Too much equipment in the local area
B. Belts are loose or broken
C. Lost signal to valve, Check pneumatic lines or electricity to valve is operating properly
D. Unit bypassing or blowing off too much air


# Answer

Answer: C. Lost signal to valve, Check pneumatic lines or electricity to valve is operating properly

Guidance Rationale:

The Air Handling Unit (AHU) is not running, yet the mixed
air temperature is unusually high—exceeding 90 °F—even though the outdoor air
temperature (OAT) is within a moderate range of 35 °F to 70 °F. Additionally,
the Heating Drained Flag is set to 1 (if reporting), and the heating valve
position is at 0%, indicating that no heating should be occurring. Despite this,
the elevated mixed air temperature suggests that heating is still being
delivered, implying that the valve is unintentionally allowing hot water or
steam through. The most likely cause is a lost control signal to the valve,
possibly due to electrical failure or issues with pneumatic lines. Since this
abnormal condition has persisted for 3 hours, it reflects a sustained control
failure rather than a transient operational change. 

Option A, "Too much equipment in the local area," is unlikely because it does not explain the
specific issue with the heating valve. Option B, "Belts are loose or broken," is
also unlikely as it would typically affect the AHU's ability to circulate air
rather than causing a heating issue. Option D, "Unit bypassing or blowing off
too much air," does not align with the observed high mixed air temperature and
the fact that the AHU is not running. Therefore, the most likely explanation is:
"Lost signal to valve, check pneumatic lines or electricity to valve is
operating properly."