Generac Power Systems MAC 550F Owner's Manual page 24

Troubleshooting
Problem
Exhaust Smoke is White
Exhaust smoke is Black
Engine Overheats
Oil Pressure Does Not Rise
Engine Has No Power
Overheat/shutdown condition
20
Cause
Needs more warm-up time
Too much engine oil
Engine control system fails
Injection pump failure
Fuel system failure
Long time idling (more than two hours)
Excessive speed
Injection pump failure
Air cleaner is clogged
Intercooler is clogged
Fuel system failure
Exhaust system is clogged
No coolant
Front of radiator is clogged with dust
Sub tank cap is not tightened
Coolant is fouled
Oil is in coolant
Thermostat failure
Engine oil viscosity is incorrect
Engine oil level is not sufficient
Engine failure
Meter, lamp, or switch failure
Air cleaner is clogged
Pre-fuel filter is clogged
Fuel filter is clogged
Strainer is clogged
Engine control system failure
Engine failure
Exhaust system is clogged
Fuel system failure
Type of fuel is incorrect
Electromagnetic type fuel pump failure
Access doors are open
Air outlets are not open
Front radiator or rear oil cooler are full of
debris
Engine RPM is set too high based on
ambient temperature
Faulty temperature sensor
Blower fan not operating correctly
Solution
Conduct warm-up operation
Correct oil level
Contact Generac Technical
Service
Contact Generac Technical Ser-
vice
• Verify engine RPM
• Check AVR adjustment
Contact Generac Technical
Service
Clean or change element
Contact Generac Technical
Service
Add coolant
Clean with soft brush
Tighten or replace sub tank cap
Clean inside of radiator and
change coolant
Contact Generac Technical
Service
Change thermostat
Change with oil of correct viscosity
Replenish
Contact Generac Technical
Service
Clean element
Remove water and change
element
Contact Generac Technical
Service
Close all access doors
Open the air outlets and verify
there are no obstructions or kinks
in the ducting
Clean the machine
Lower the engine RPM
Check air outlet sensor operation
Remove ducting; check blower fan
operation
Owner's Manual for Flameless Air Heater