Section 5: Troubleshooting; General Troubleshooting - Generac Power Systems MLT4200IF4 Owner's Manual

Section 5: Troubleshooting

General Troubleshooting

WARNING
Risk of burns. Allow engine to cool before
draining oil or coolant. Failure to do so could
result in death or serious injury.
Some of the more common problems are listed in the
table below. This information is intended to be a check or
verification that simple causes can be located and fixed.
It does not cover all types of problems. Refer to the OEM
engine operator's manual for additional troubleshooting
information. Procedures that require in-depth knowledge
or skills should be referred to a Generac Mobile Products
Authorized Dealer.
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
The lights are flashing
If problems persist, contact Generac Mobile Products at 1-800-926-9768 for assistance.
Owner's Manual for MLT4200IF4 Light Tower
(000139)
Possible Cause
Fuel level low.
Fuel flow obstructed.
Fuel solenoid inoperable.
Air in fuel system.
Restricted air filter.
Glow plug(s) inoperable.
Ambient temperature too
low.
Intake heater inoperable.
Low coolant level.
Blockage in radiator.
Debris on radiator face.
broken coolant pump belt.
cooling fan inoperable.
Oil level low.
Oil pump inoperable.
Load exceeds unit rating.
Dusk-to-dawn sensor
adjustment needed.
Generator frequency too
low.
Solution
Check fuel level in tank.
Verify fuel pump operation.
Verify fuel solenoid operation.
Bleed air from fuel system.
Inspect air filter for blockage.
Inspect fuel supply hose from tank to fuel filter for cracks and
abrasion.
Check for gelled fuel in fuel system in cold weather, especially at
fuel filter.
Refer to OEM engine operator's manual for additional
information.
Check if ambient temperature is within unit limits.
Check engine air inlet heater functionality.
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. Verify tension of water pump drive belt.
Remove load on generator and restart engine. Verify coolant
temperature and shut engine down immediately if it starts to
overheat.
Check oil level. Add oil if necessary.
Turn outlet breaker ON and load sense switch OFF, confirm
generator output is 60hz + or - 2hz. Reapply load.
Adjust the dusk-to-dawn sensor to increase or decrease light
received.
Turn off main breaker.
Check if AC frequency is >40hz.
Troubleshooting
37