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 in 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 plugged

1.

Check, replace air cleaner.

and runs rough.

 

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 to regulator

 

 

 

 

is 11-14” water column (0.6 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 2.1).

 

 

*Contact your nearest Generac/Guardian Authorized Dealer for assistance.

Generac® Power Systems, Inc. 23

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Generac Power Systems 04456-1, 04390-1, 04389-1 owner manual Troubleshooting Guide, Problem Cause Correction
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04389-1, 04456-1, 04390-1 specifications

Generac Power Systems is synonymous with reliable and innovative power solutions for both residential and commercial applications. Among its diverse product lineup, the Generac 04390-1, 04456-1, and 04389-1 stand out due to their robust features, advanced technologies, and user-focused characteristics.

The Generac 04390-1 is a portable generator designed for versatility and efficiency. It is equipped with a powerful OHV engine that enables it to deliver up to 3500 running watts and 4375 starting watts, making it suitable for various applications, such as home backup during outages or powering tools on job sites. The generator features a built-in PowerRUSH technology, which provides a 40% more starting capacity than traditional models, allowing it to handle more demanding appliances and tools simultaneously. Additionally, its lightweight and compact design enhance portability, complemented by a sturdy handle and flat-free wheels.

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Collectively, the Generac 04390-1, 04456-1, and 04389-1 models embody a commitment to quality and innovation. With their powerful engines, enhanced technologies, and user-friendly features, these generators provide peace of mind through reliable power solutions, catering to a multitude of needs for both residential and commercial users alike. Whether for emergency backup or regular use, Generac’s offerings ensure that power is always on hand when it’s needed the most.
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