Section 4 - Troubleshooting; Troubleshooting Guide - Generac Power Systems 04077-01, 04109-1, 04079-1, 00789-1, 00844-1 Installation And Adjustment Manual

4.1

TROUBLESHOOTING GUIDE

PROBLEM
The engine will not crank.
The engine cranks but
will not start.
The engine starts hard
and runs rough.
The engine starts but shuts
down immediately.
The Auto/Off/Manual switch
is set to OFF , but the engine
continues to run.
There is no AC output from
the generator.
There is no transfer to
standby after utility
source failure.
Unit starts automatically when
switched to the AUTO position.
System Set LED is not lit when
switched to the AUTO position.
CAUSE
1. Fuse blown
2. Loose, corroded or defective
battery cables
3. Defective starter contactor
4. Defective starter motor
5. Dead battery
1. Out of fuel
2. Defective fuel solenoid (FS)
3. Open #14 wire from
engine control board
4. Defective spark plug(s)
1. Air cleaner
plugged or damaged
2. Defective spark plug(s)
1. Engine oil level low
2. Defective low oil
pressure switch
3. Defective high temperature
switch
4. Defective control board
1. Defective Auto/Off/Manual
switch
2. Auto/Off/Manual switch
wired incorrectly
3. Defective control board
1. Main line circuit breaker open
2. Generator internal failure
1. Defective transfer switch coil
2. Defective transfer relay
3. Transfer relay circuit open
4. Defective control logic board
1. Utility not present.
2. Defective Auto/Off/Manual
switch
1. Failure present, i.e., low oil
pressure
2. Dip switch 2 set to the ON
position
Section 4 — Troubleshooting
Guardian Air-cooled Generators
CORRECTION
1. Replace fuse.
2. Tighten, clean or replace
as necessary.
3. Replace starter contactor.
4. Replace starter motor.
5. Charge or replace battery.
1. Replenish fuel.
2. Replace fuel solenoid.
3. Check connections and
insulation of #14 wires.
4. Clean, re-gap or replace plug(s).
1. Check, clean or replace
air cleaner.
2. Clean, re-gap or replace plug(s).
1. Check oil and add oil as needed.
2. Replace pressure switch.
3. Replace temperature switch.
4. Replace control board.
1. Replace switch.
2. Check wiring and connections.
3. Replace control board.
1. Reset circuit breaker
to ON (closed) position.
2. Contact an Authorized
Dealer.
1. Replace transfer switch coil.
2. Replace transfer relay.
3. Close transfer relay circuit.
4. Replace control logic board.
1. Switch dip switch 2 on control
board if utility is not available.
Check all connections if utility
should be present.
2. Replace switch.
1. Correct failure.
2. Switch to the OFF position if
desired.
Generac ® Power Systems, Inc. 27