Section 5 Troubleshooting; General Troubleshooting Guide - Generac Power Systems MAC 950F Owner's Manual

Section 5 Troubleshooting

General Troubleshooting Guide

Problem
Engine Will Not Crank
Starter Cranks Slowly
Hard to Start or Will Not Start
Owner's Manual for Flameless Air Heater
Cause
Low battery output voltage or discharged
battery
Loose or corroded connections
Faulty start circuit relay
Blown fuse
Defective main switch or start safety
switch
Starter solenoid defective
Starter defective
Low battery output voltage or discharged
battery
Too high viscosity crankcase oil
Loose or corroded connections
Engine starting under load
Improper starting procedure
Exhaust restricted
No fuel
Air in fuel line
Poor fuel quality
Water, dirt, or air in fuel system
Fuel filter restricted or full of water
Dirty or faulty fuel injectors
Electronic fuel system problem
Cold weather
Too high viscosity crankcase oil
Electronic Control System Problem or
Basic Engine Problem
Troubleshooting
Solution
Charge or replace batteries
Clean and tighten connections
Contact an IASD
Replace fuse
Repair switch as required
Replace solenoid
Replace starter
Charge or replace batteries
Drain crankcase oil and replace
with correct viscosity oil
Clean and tighten connections
Disengage PTO
Review starting procedure
Check and correct exhaust restric-
tion
Check fuel tank
Bleed fuel lines
Drain fuel and replace with proper
grade and quality of fuel for operat-
ing condition
Drain, flush, fill, and bleed fuel sys-
tem
Replace fuel filter or drain water
from fuel filter
Contact an IASD
Use cold weather starting aids
(see engine manual)
Drain crankcase oil and replace
with correct viscosity oil
Contact an IASD
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