What to do if Airtec 89NAH show ER1 error?
- AAshley JamesAug 1, 2025
If your Airtec Measuring Instruments display the error message ER1, it indicates that the sensor is either not properly connected or has reached the end of its operational life. To resolve this, first, check the sensor connection and then reset the unit. If the error persists after resetting, you will need to replace the sensor and reset the unit again.

