Yamaha F150 Owner's Manual page 56

Engine control system
 The pop-up window will appear on the
Multi-Display.
 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 94 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 en-
gine is started and the control lever is
moved to the forward or reverse position,
do not use the outboard motor. Otherwise,
serious engine damage could occur.
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ZMU05424
ZMU08535