Section 5 — Troubleshooting

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

5.1TROUBLESHOOTING GUIDE

PROBLEM

CAUSE

CORRECTION

The engine will not crank.

1.

Fuse blown

1.

Replace 15A fuse on generator

 

 

 

 

control panel.

 

2.

Loose, corroded or defective

2.

Tighten, clean or replace

 

 

battery cables

 

as necessary.

 

3.

Defective starter contactor (7 kW) 3.

*

 

4.

Defective starter motor

4.

*

 

5.

Dead Battery

5.

Charge or replace battery.

 

 

 

 

 

The engine cranks but

1.

Out of fuel

1.

Replenish fuel.

will not start.

2.

Defective fuel solenoid (FS)

2.

*

 

3.

Open #14 wire from

3.

*

 

 

engine control board

 

 

 

4.

Defective spark plug(s)

4.

Clean, re-gap or replace plug(s).

 

5.

Valve lash out of adjustment.

5.

Reset valve lash.

 

 

 

 

 

The engine starts hard

1.

Air cleaner

1.

Check, replace air cleaner.

and runs rough.

 

plugged or damaged

 

 

 

2.

Defective spark plug(s)

2.

Clean, re-gap or replace plug(s).

 

3.

Fuel regulator not set.

3.

Set fuel regulator.

 

4.

Fuel pressure incorrect.

4.

Confirm fuel pressure is at 11”-14”

 

 

 

 

water column (0.4 psi - 0.5 psi).

 

 

 

 

 

The AUTO/OFF/MANUAL switch

1.

Defective switch

1.

*

is set to OFF, but the engine

2.

AUTO/OFF/MANUAL switch

2.

*

continues to run.

 

wired incorrectly

 

 

 

3.

Defective control board

3.

*

 

 

 

 

 

There is no AC output from

1.

Main line circuit breaker open

1.

Reset circuit breaker

the generator.

 

 

 

to ON (or closed).

 

2.

Generator internal failure

2.

*

 

 

 

 

 

There is no transfer to

1.

Defective transfer switch coil

1.

*

standby after utility

2.

Defective transfer relay

2.

*

source failure.

3.

Transfer relay circuit open

3.

*

 

4.

Defective control logic board

4.

*

 

 

 

 

 

Unit consumes large

1.

Break-in procedure

1.

*

amounts of oil.

 

not followed (see Section 3.1)

 

 

*Contact the nearest Generac Authorized Dealer for assistance.

Generac® Power Systems, Inc. 23

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Generac Power Systems 04758-1, 04759-1, 04760-1 owner manual Troubleshooting Guide, Problem Cause Correction
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04758-1, 04759-1, 04760-1 specifications

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The Generac 04758-1 is a robust standby generator that delivers a powerful output of 22kW. It is designed to automatically kick in during power outages, ensuring that homes remain powered without the need for manual intervention. One of its main features is the innovative Mobile Link app, which allows users to monitor their generator's status remotely through their smartphones. This model also incorporates Generac's G-Force engine, which is designed with durability in mind, providing longer run times and enhanced performance.

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