Yamaha EF5500DE Owner's Manual page 17

ERR (Error) indicator light (Orange)
If the CO SENSOR detects a system malfunction or
service life over, the engine will stop automatically and
the ERR (Error) indicator will come on approximately 5
minutes.
TIP
9 The CO SENSOR has a limited service life and
must be replaced when it no longer functions. The
battery is non-replaceable battery.
9 The generator stopping period and storage period
are also in the useful service life of the CO
SENSOR.
9 The lithium battery adopted on this sensor con-
tains perchlorate, a toxic substance controlled in
perchlorate Best Management Practices (BMP)
regulations passed by the California legislature.
When you discard the lithium battery in California,
USA, please follow the related regulations in
advance.
Perchlorate material-special handling may apply,
see www.dtsc.ca.gov/hazardouswaste/perchlorate
9 Consult a Yamaha dealer for the CO SENSOR
replacement.
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