Volvo Penta D13 Series Operator's Manual page 85

Start Relay
Possible cause: There is a faulty start relay. If the engine is off, it will not start until the fault is corrected.
Corrective action: Check the engine fuses. Refer to Fuses, page 113.
Transmission Oil Pressure
Possible cause: The reverse gear oil pressure is too low.
Corrective action: •
Water in Fuel
Possible cause: Water has entered the fuel filter(s).
Corrective action: Empty the water trap underneath the fuel filters. Refer to Maintenance, page 98.
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Check the reverse gear oil level.
Fault Code Register
83