Yamaha F225 Owner's Manual page 58

Engine control system
The buzzer will sound intermittently when

the control lever is in the neutral position.
If the alert system has activated, stop the en-
gine immediately and see page 99 of this
manual to drain the water from the fuel filter.
Get back to the port soon and consult a
Yamaha dealer immediately.
ECM02471
NOTICE
Although the buzzer will stop when the
engine is started and the control lever is
moved to the forward or reverse position,
do not use the outboard motor. Other-
wise, serious engine damage could oc-
cur.
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ZMU08535