Generac Power Systems MLT6SMD Owner's Manual page 48

Troubleshooting
Problem
Unit cranks, but will not start
Unit starts, but stumbles and dies
High coolant temperature shutdown
Low oil pressure shutdown
Unit stalls when export power is used
One or more lights do not turn on
The lights are flashing
If problems continue, contact Generac Mobile Products, LLC at 1-800-926-9768 for assistance.
44
Possible Cause
Low fuel level.
Fuel flow obstructed.
Air in fuel system.
Restricted air filter.
Glow plug(s) inoperable.
Low ambient temperature.
Intake heater inoperable.
Air in fuel lines.
Low coolant level.
Blockage in radiator.
Debris on radiator face.
Broken coolant pump belt.
Cooling fan inoperable.
Low oil level.
Oil pump inoperable.
Load exceeds unit rating.
Light breaker tripped.
Lights not turned on.
Dusk-to-dawn sensor
adjustment needed.
Low generator frequency.
Solution
Verify fuel level in tank.
Check fuel pump operation.
Inspect fuel supply hose from tank to fuel filter for
cracks and abrasion.
Inspect for gelled fuel in fuel system in cold
weather, especially at fuel filter.
Purge air from fuel system.
Inspect air filter for blockage.
Refer to OEM engine operator's manual for
additional information.
Verify if ambient temperature is within unit limits.
Inspect engine air inlet heater functionality.
Purge air from fuel lines.
Allow engine to cool, then check coolant level in
radiator. Add coolant if needed.
Inspect radiator surroundings for blockage and
remove any foreign matter.
Inspect for visible leaks. Check tension of water
pump drive belt.
Remove load on generator and restart engine.
Check coolant temperature and shut engine down
immediately if it starts to overheat.
Check oil level. Add oil if necessary.
Contact a GMP ASD.
Turn outlet breaker ON and load sense switch
OFF, confirm generator output is 60 Hz ± 2 Hz.
Reapply load.
Inspect light breakers.
Inspect electronic control to see if lights are on.
Turn lights on.
Adjust the dusk-to-dawn sensor according to
Dusk to Dawn Sensor
.
Verify AC frequency is >40hz.
Owner's Manual for MLT6SMD Light Tower