Below is a list of operational statuses that can apply to an FP AHU. The current status of an FP AHU can be viewed in the top-left corner of the diagram on the FP AHU Control Screen.
FP AHU status and reference temperature
Normal operating statuses are listed below followed by fail-safe operating statuses.
| Status | Description |
| AHU_FAILON_MANUAL | AHU in WEMS fail-safe mode. No WEMS control is applied |
| AHU_INIT | Transition state after removal of fail-safe mode |
| AHU_ALL_OFF | AHU off and alarms disabled |
| AHU_LOWSPEED | AHU enabled with fan at slow speed (if exists) |
| AHU_FULLSPEED | AHU enabled with fan at full speed |
| AHU_FULLSPEED_DX | AHU enabled with fan at full speed and DX (mechanical) cooling enabled |
| AHU_FULLSPEED_TEMP_DIFF | AHU enabled with at fan full speed. Force fresh air cooling due to difference between outside air and room air temperature being greater than the Temp Diff Setpoint |
| Status | Description |
| AHU_FAILON_MIN_OUT_AIR | Outside air is below the minimum value |
| AHU_FAILON_MAX_OUT_AIR | Outside air is above the maximum value |
| AHU_FAILON_TEMP_REF_MAX | Maximum Zone reference temperature exceeded |
| AHU_FAILON_TEMP_REF | System cannot evaluate a valid reference temperature |