This is not a complete list. It includes some of the most commonly seen error codes on the meters.

Error

Meaning

E01

2 year life has expired and unit was turned off

E02

2 year life + 8 hour has expired and unit timed out

E03

Battery capacity counter depleted

E04

Battery test failed 3 consecutive times

E05

Sensor test failed 3 consecutive times

E06

Calibration or EEPROM fault

E07

Calibration gas out of range

E08

RAM / ROM / EEPROM checksum failed