Owner’s Manual for Flameless Air Heater 19
Troubleshooting
Section 5 Troubleshooting
General Troubleshooting Guide
Problem Cause Solution
Engine Cranks But Will Not
Start
No fuel.
Verify there is no fuel leakage and
replenish.
Low oil level. Replenish oil to full.
Emergency shutdown switch is ON.
Turn emergency shutdown switch
OFF.
Air in fuel system. Bleed air.
Fuel filter is clogged.
Remove water and change ele-
ment.
Fuel is frozen.
Warm fuel pipes with hot water or
wait until ambient temperature
rises.
Injection pump fails.
Contact Generac Technical
Service
Electromagnetic type fuel pump failure.
Engine control system failure.
Restricted air flow. Check/replace air filter.
LCD Display panel shows engine failure.
Contact Generac Technical
Service
Strainer is clogged.
Pre-heating device failure.
Engine Will Not Crank
(Electric Start)
Dead battery. Replace battery.
Battery terminal is disconnected, loose or
corroded.
Replace corroded part and tighten
securely.
Starter ground terminal is disconnected,
loose or corroded.
Engine oil viscosity is too high. Change with oil of correct viscosity.
Starter or electrical system failure.
Contact Generac Technical
Service.
Engine Starts But Stops
Shortly Thereafter
Idling is too low.
Adjust by idling control equipment
on the machine. If adjustment is
not possible, contact ISUZU
dealer.
Fuel filter is clogged.
Remove water and change ele-
ment.
Pre-fuel filter is clogged.
Clean or change element.
Air cleaner is clogged.
Engine control system failure.
Contact Generac Technical
Service.
Injection pump failure.
Strainer is clogged.
Electromagnetic type fuel pump failure.
Engine Running is Unstable
Fuel system failure.
Water or air is in fuel system. Bleed air or remove water.
Engine control system failure.
Contact Generac Technical
Service.
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