3004811-2018-09-14 Alarms Device Fault code Category Airflow/pressure Alarm description Troubleshooting (See appendix 1: "Simplified diagrams" for the positioning of dampers, xx yy z sensors, air directions, etc.) 20 01 1 Airflow/pressure in ex- The unit provides airflow that is 25% above the set point. 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 provides airflow that is 25% above the set point for more tract air duct airflow too than five minutes. high for last five 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 provides airflow/pressure that is 25 % below the set point. tract air duct airflow too ● Check the fan speed settings in indoor air quality level and the low fan limits. 20 04 2 Airflow/pressure in ex- The unit has provided airflow/pressure that is 25 % below the set tract air duct airflow too point for more than 5 minutes. low for last five minutes ● Check the fan speed settings in indoor air quality level and the fan limits. 20 05 1 Airflow/pressure in supply air duct airflow too high The unit provides airflow that is 25% above the set point. ● Check the fan speed settings in indoor air quality level and the fan limits. 20 06 2 Airflow/pressure in The unit provides airflow that is 25% above the set point for more supply air duct airflow than five minutes too high for last five mi- ● Check the fan speed settings in indoor air quality level and the nutes fan limits 20 07 1 Airflow/pressure in supply air duct airflow too low The unit provides airflow/pressure that is 25 % below the set 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 airflow point for more than 5 minutes too low for last five mi- ● Check the fan speed settings in indoor air quality level and the nutes fan limits 20 09 1 Minimum supply air The required supply airflow for operating cooling/heating units was duct airflow for cooling/ not achieved. warming not achieved ● Check the fan speed settings in indoor air quality level and the fan limits. 20 10 3 Minimum supply air The required supply airflow for operating cooling/heating units was duct airflow for cooling/ not achieved within five minutes. warming not achieved ● Check the fan speed settings in indoor air quality level and the in last five minutes fan limits. 87/120
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