Yamaha EF5500DE Owner's Manual page 61

CO SENSOR Indicator Lights flash or come on abnormally
If the generator shows any of the following conditions upon starting or during operation,
consider your own safety, stop the generator, and then please consult a Yamaha dealer.
Status
Upon starting
During operation
For any other abnormal operating conditions not covered here, please consult a Yamaha
dealer.
Check
Upon starting, both the "CO
SENSOR WARNING indicator
light" and the "CO SENSOR
ERR (Error) indicator light" do
not flash 5 times, or either one
does not flash 5 times.
Dur ing operation, the "CO
SENSOR WARNING indicator
light" flashes for approximately
5 minutes.
Dur ing operation, the "CO
SENSOR ERR (Error) indicator
light" comes on for approxi-
mately 5 minutes.
– 56 –
Engine
Starts
Runs
Runs