3005167-2022-02-02 Alarms Unit Fault code Category Airflow/pressure Alarm description Troubleshooting (See appendix 1: "Simplified diagrams" for the location of dampers, sen- xx yy z sors, air directions, etc.) 20 01 1 Airflow/pressure in ex- The unit provides airflow that is 25% above the setpoint. tract air duct airflow too ● Check the fan speed settings in indoor air quality level and the high fan limits. 20 02 2 Airflow/pressure in ex- The unit has provided an airflow/pressure that is 25% above the tract air duct has been setpoint for more than 30 minutes. too high for last 30 mi- ● Check the fan speed settings in indoor air quality level and the nutes. fan limits. 20 03 1 Airflow/pressure in ex- The unit is providing an airflow/pressure that is 25% below the set- tract air duct too low point. ● Check the fan speed settings in indoor air quality level and the fan limits. 20 04 2 Airflow/pressure in ex- The unit has provided airflow/pressure that is 25 % below the set- tract air duct has been point for more than 30 minutes. too low for last 30 mi- ● Check the fan speed settings in indoor air quality level and the nutes fan limits. 20 05 1 Airflow/pressure in The unit provides airflow that is 25% above the setpoint. supply air duct too high ● Check the fan speed settings in indoor air quality level and the fan limits. 20 06 2 Airflow/pressure in supply air duct has been too high for last 30 minutes The unit has provided an airflow/pressure that is 25% above the setpoint for more than 30 minutes. ● Check the fan speed settings in indoor air quality level and the fan limits. 20 07 1 Airflow/pressure in The unit is providing an airflow/pressure that is 25% below the set- supply air duct too low point. ● Check the fan speed settings in indoor air quality level and the fan limits. 20 08 2 Airflow/pressure in The unit has provided airflow/pressure that is 25 % below the set- supply air duct has point for more than 30 minutes. been too low for last 30 ● Check the fan speed settings in indoor air quality level and the minutes fan limits. 20 09 1 Minimum airflow for The required supply airflow for operating cooling/heating units was cooling/heating units in not achieved. the supply air duct was ● Check the fan speed settings in indoor air quality level and the not achieved fan limits. 20 10 3 Minimum airflow for The required supply airflow for operating cooling/heating units was cooling/heating units in not achieved within 30 minutes. the supply air duct has ● Check the fan speed settings in indoor air quality level and the not been achieved for fan limits. last 30 minutes 20 11 1 Cooling cannot be re- The required air balance between supply air and extract air is high- leased because sup- er than the permitted limit of 1. 15:1 ply/extract airflow ratio ● Check the fan speed settings in indoor air quality level and the was not achieved fan limits. 80/108
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