Generac Power Systems MDG25IF4, Owner'S Manual

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Owner’s Manual for Mobile Generator 41
Section 5: Troubleshooting
General Troubleshooting
This information is intended to be a check or verification
for simple causes that can be located and fixed. It does
not cover all types of problems. See the engine operator’s
manual for additional troubleshooting information. Proce -
dures that require in-depth knowledge or skills should be
performed by a GMASD.
Problem Possible Cause Solution
Low fuel level shutdown
Low fuel level
Unit not level
Fuel tank leaking
Damaged fuel sender or wir -
ing
Check fuel level in LCD window of controller.
Confirm that unit is sitting level to ensure an accurate reading.
Check tank for leaks.
Check for continuity between sender and engine controller. (See
Wiring Diagrams
.)
Low oil pressure shutdown Low oil level
Oil leaking from engine
Oil pressure sender
Check oil level on dipstick. Add oil, if needed.
Visually inspect the engine for leaks. Restart unit and verify loss of
pressure. Shut down immediately if pressure does not reach 5 psi
(34 kPa) within five seconds.
See engine operator’s manual to identify corrective action.
Low coolant level shutdown Low coolant level
Coolant hoses leaking
Engine block or water pump
leaking
Allow engine to cool, then check coolant level in radiator. Add cool -
ant, if needed.
Inspect hoses for leaks. Repair or replace as necessary.
Visually inspect for leaks. Verify no coolant has mixed with the
engine oil (oil will appear milky). See engine operator’s manual for
additional information.
High coolant temperature
shutdown
Low coolant level
Blockage in radiator
Leakage in coolant hoses,
engine block, or water pump
Allow engine to cool, then check coolant level in radiator. Add cool -
ant if needed. Restart engine and check coolant temperature (on
controller). Stop engine immediately if coolant temperature is 203 °F
(95 °C) or higher.
Check radiator shroud and ducting for blockage and remove any
foreign matter.
Inspect for visible leaks. Check tension of water pump serpentine
drive belt.
Remove load on generator and restart engine. Check coolant tem -
perature and shut engine down immediately if it starts to overheat
210° F (99° C). See the engine operator’s manual for additional
information on engine overheating.
Overcrank shutdown Fuel level low
Blocked air filter
Check fuel level in tank.
Check fuel pump operation.
Check air filter for blockage.
NOTE: See OEM engine manual for more information.