This section helps you to understand the different problems that may arise on your generating set. The safest way
to correct the problems you may encounter, however, is to contact a qualified engineer. Some operations must be
carried out by a qualified Nanni Diesel authorised engineer. These operations are marked in bold in the tables below.
This non-exhaustive list serves as a tool in emergencies and should never be considered a repair procedure. Some
of the components listed may not be part of your engine.
Faults and probable causes
Engine does not start / starter does not turn
Faults
Solution
Circuit breaker is open or fuse has blown
Check and re-install the circuit breaker or replace
the fuse or replace the circuit breaker
Electrical circuit breaker is not working
Electrical connections are faulty
Check the electrical connections and wires (especially
the battery cables) Clean and tighten the connections
Battery faulty
Test and charge or replace the battery if faulty
Starting procedure defective
Read and implement the starting procedure
Fuel tank empty or fuel cock closed
Fill the tank or open the cock
Fuel pump faulty
Replace the pump
Fuel filters clogged or water present
Clean or replace the fuel filters or drain the water from
the prefilter then drain the circuit
Fuel contaminated or too old
Drain the tank if contaminated and fill with clean fuel
Fuel pipe or air pipe of tank blocked or bent
Replace the bent pipes or blow in compressed air
to remove the obstruction
Air present in fuel injection system
Drain the injection system
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Troubleshooting
