UEi Test Instruments DAFM3 - Manual (Page 14)

Troubleshooting
13
Power on but Press the power key more than 3 seconds
no display Replace the battery and try again
Remove the battery and wait one minute
Reinstall and try again
E1 The probe is not connected or damaged
E2 The value is underflow
E3 The value is overflow
E4 The original data that is relative to this
value has an error
E5 Out of meter display range
E6. The value is not calculated completely
E11 Humidity Calibration error