Error Message Displays
1.
ER1:
Relative Humidity measurement failure. Have the meter
repaired or replaced.
2.
ER2:
Internal temperature circuit failure. Have the meter repaired or
replaced.
3.
ER3:
Reference resistance failure. Have the meter repaired or
replaced.
4.
ER4:
Internal temperature sensor measurement is out of range.
Always measure within the published specified range.
5.
ER5:
External temperature sensor measurement is out of range.
Always measure within the specified range of the external
temperature sensor.