Yamaha LF115 Owner's Manual page 59

 The buzzer will sound intermittently when
the remote control lever is in the neutral po-
sition.
If the alert system has activated, stop the en-
gine and check the fuel filter. If any water is
found in the fuel, consult a Yamaha dealer.
ECM02341
NOTICE
Although the buzzer will stop when the en-
gine is started and the remote control le-
ver is moved to the forward or reverse
Engine control system
position, do not use the outboard motor.
Otherwise, serious engine damage could
occur.
ZMU07011
ZMU07012
ZMU07859
53