Yanmar 4LHA-HTP Operation Manual page 22

(2) Functions of Alarm Devices (Alarm Buzzer & Lamps)
The alarm buzzer sounds when any warning lamp (except the charge lamp) comes on.
1)
Warning lamps come on when sensors (switchs) detect an abnormality during engine operation.
2)
The warning lamps in the display column of the control panel are off during normal operation,
but come on as follows when an abnormality arises:
Charge Lamp
BATTERY
CHARGE
Cooling Water Temp. Warning Lamp
C.WATER
TEMP
Lube Oil Pressure Warning Lamp
LUB.OIL
PRESS.
Fuel Filter Drain Warning Lamp.
FUEL
FILTER
Gear Oil Level In The Stern Drive Warning Lamp
GEAR
OIL
Boost Pressure Warning Lamp
BOOST
(3) Functions of Warning Devices
When the key switch is turned on, the alarm devices functions as follows
1) Turning the key to ON :
Warning buzzer sounds
The BATTERY CHARGE and LUB. OIL PRESS. come on. The C.WATER TEMP, FUEL
FILTER, GEAR OIL and BOOST lapms do not come on.
(Note) When the warning buzzer and lamps function as above, everything is normal.
2) When the key switch is turned to START to start the engine and then returned to ON after
the engine starting up.
The warning buzzer stops sounding.
All warning lamps go off.
devices. If they do not work normally, contact your dealer.
The lamp comes on when there is a charging failure. The alarm buzzer
does not sound. Check for breakage in the alternator V-belt
The lamp comes on when the cooling water (LLC) gets too hot.
Check the water level in the sub-tank and cooling water tank, and the
discharge volume of the cooling seawater.
The lamp comes on when the engine lube oil pressure drops.
Check the engine oil level.
The lamp comes on when the drain in the water separator located bottom of
the fuel filter becomes excessive.
Clean out the drain in the water separator.
The lamp comes on when the gear oil level in the stern drive falls below the
specified level.
Check the amount of gear oil in the stern drive.
The lamp comes on when the intake air boost pressure (intake air boost
pressure of turbocharger) rises abnormaly.
After the engine starts up, make it the rule to check alarm
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