Generac Power Systems 38 kW

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Owner’s Manual

For

Spark-Ignited Stationary Emergency Generators

Residential and Commercial

This manual should remain with the unit.

This manual must be used in conjunction

with the appropriate installation manual.

*

NOT INTENDED FOR USE IN CRITICAL

LIFE SUPPORT APPLICATIONS.

*

ONLY QUALIFIED ELECTRICIANS OR

CONTRACTORS SHOULD ATTEMPT

INSTALLATION!

*

DEADLY EXHAUST FUMES! OUTDOOR

INSTALLATION ONLY!

22 kW 2.4L

25 kW 1.5L

27 kW 2.4L

30 kW 1.5L

32 kW 2.4L

36 kW 2.4L

38 kW 2.4L

45 kW 2.4L

48 kW 5.4L

60 kW 2.4L

Para español , visita:

http://www.generac.com/service‐support/product‐support‐lookup

Pour le français, visiter : http://www.generac.com/service‐support/product‐support‐lookup

Table of Contents

Questions and Answers:

P
phillip46Aug 4, 2025
Why Generac Power Systems 38 kW Portable Generator engine will not crank?
- R
  Robert CamposAug 4, 2025
  If your Generac Power Systems Portable Generator engine won't crank, here's what might be happening: * A blown fuse could be the culprit. Replace the 7.5 amp fuse in the generator control panel. If it blows again, there may be a short circuit that needs fixing. * Loose, corroded, or defective battery cables can also prevent cranking. Try tightening, cleaning, or replacing them as needed. * A defective starter contact or starter motor could also be the reason. Tighten, clean, or replace these components as necessary. * The battery might be dead. In this case, charge or replace the battery.
S
Shane MorganAug 8, 2025
What to do if Generac Power Systems Portable Generator unit shuts down during operation?
- B
  Brandon HudsonAug 8, 2025
  If your Generac Power Systems Portable Generator unit shuts down during operation, it could be due to several reasons: * **High Temperature:** Ensure there's enough ventilation around the intake, exhaust, and rear of the generator. If there are no obstructions, contact a dealer. * **Overload:** Clear the alarm, remove loads from the generator, put back in AUTO, and restart. * **RPM Sense Loss:** Clear the alarm, remove loads from the generator, put back in AUTO, and restart. If the problem continues, contact a dealer to check for fuel issues.
D
Darlene CarterAug 12, 2025
What to do if Generac Power Systems 38 kW engine cranks but will not start?
- D
  Daniel HarrisonAug 12, 2025
  If your Generac Power Systems Portable Generator engine cranks but won't start, consider these potential causes: * **Out of fuel:** Replenish the fuel supply and ensure the fuel valve is turned on. * **Open F1 7.5 amp fuse:** Replace the F1 7.5 amp fuse. If it blows again, there might be an issue requiring further inspection. * **Open F2 15 amp fuse:** Replace the F2 15 amp fuse. If it blows again, further inspection may be needed. * **No fuel supply:** Make sure the fuel supply is turned on.
T
Thomas BerryAug 16, 2025
How to fix no AC output from Generac Power Systems Portable Generator?
- K
  Kathryn ThompsonAug 17, 2025
  If your Generac Power Systems Portable Generator is not producing AC output, check if the main line circuit breaker is in the OFF (OPEN) position. If so, reset the circuit breaker to the ON (CLOSED) position.
T
Teresa WilkersonAug 21, 2025
Why Generac Power Systems 38 kW Portable Generator unit consumes large amounts of oil?
- C
  Catherine LiuAug 21, 2025
  If your Generac Power Systems Portable Generator unit consumes large amounts of oil, the following reasons are possible: * The engine is overfilled with oil. Adjust the oil to the correct level. * The oil type or viscosity is incorrect. Refer to the Engine Oil Recommendations. * There is a damaged gasket, seal, or hose. Check for oil leaks.
G
Gabrielle BakerAug 26, 2025
Why Generac Power Systems 38 kW engine starts hard and runs rough?
- A
  ashleybutlerAug 26, 2025
  If your Generac Power Systems Portable Generator engine starts hard and runs rough, the air cleaner might be plugged or damaged. Inspect and replace the air cleaner if necessary.
P
Patrick RamirezAug 30, 2025
What to do if Generac Power Systems 38 kW Portable Generator unit will not start in AUTO with utility loss?
- B
  Bryce FrazierAug 30, 2025
  If your Generac Power Systems Portable Generator unit will not start in AUTO with utility loss, the following reasons are possible: * NOT ACTIVATED: Refer to activation section in Owner’s Manual. * LOW OIL PRESSURE: Check oil level. Add oil per Owner’s Manual. Contact servicing dealer if oil level is correct. * OVERCRANK: Clear alarm. Attempt to start the unit in MANUAL. If it does not start or starts and runs rough, contact servicing dealer. * OVERSPEED: Contact servicing dealer. * UNDER VOLTAGE: Contact servicing dealer. * UNDERSPEED: Contact servicing dealer. * MISWIRE: Contact servicing dealer. * OVERVOLTAGE: Contact servicing dealer.

Generac Power Systems 38 kW Specifications

General

Brand	Generac Power Systems
Model	38 kW
Category	Portable Generator
Language	English

Summary

Section 1 Safety

1.2 Safety Information

Provides essential safety rules and precautions for operating the generator.

1.3 General Hazards

Discusses general hazards related to installation, operation, and maintenance.

1.4 Exhaust Hazards

Details hazards associated with deadly carbon monoxide from exhaust.

1.5 Electrical Hazards

Outlines dangers of electrical shock from generator operation.

1.6 Fire Hazards

Covers safety measures related to fire prevention during installation and operation.

1.7 Explosion Hazards

Warns about potential explosion risks and the need for a transfer switch.

Section 3 Activation and Startup

3.3 Install Battery

Step-by-step guide for safely installing the battery.

3.5 Activate Unit

Details the process of activating the generator unit via website or phone.

3.6 Start and Run Engine

Instructions for starting and running the engine manually.

3.7 Operational Checks

Outlines essential checks to perform before and during operation.

3.7.3 Electrical Checks

Details critical electrical checks before generator startup.

3.7.4 Test Generator Under Load

Provides steps for testing the generator's performance under load.

3.7.5 Check Automatic Operation

Instructions for verifying the generator's automatic operation sequence.

Section 4 Operation

4.1 Control Panel

Overview and description of the generator's control panel functions.

4.2 AutoManualOff

Explains the Auto, Manual, and Off modes of operation.

4.3 Menu Navigation

4.4 AlarmWarning Conditions

Lists and explains various alarm and warning messages displayed by the unit.

4.9 Transfer Switch Automatic Operation

Explains how the generator operates automatically with the transfer switch.

4.9.1 Automatic Sequence of Operation

Outlines the sequence of events during automatic operation.

4.9.1.1 Utility Failure

Describes the generator's response to a utility power failure.

4.9.1.3 Load Transfer

Explains how loads are transferred to the generator.

4.10 Transfer Switch Manual Operation

4.10.1 Transfer to Generator Power

4.10.2 Transfer Back to Utility Power

Section 5 Maintenance

5.3 Service Maintenance Intervals

Provides a schedule for routine maintenance tasks.

5.4 Remove From Service

5.6 Daily Maintenance

5.7 Schedule A Maintenance

Details maintenance tasks to be performed annually or every 125 hours.

5.7.5 Check Coolant Level and Hoses

5.7.7 Check Lubricating Oil Level and Drain Hose

5.7.8 Replace Lubricating Oil and Oil Filter

Detailed instructions for replacing engine oil and oil filter.

5.8 Schedule B Maintenance

Details maintenance tasks performed every two years or 250 hours.

5.8.2 DrainFlush Coolant System

5.8.3 CleanGapReplace Spark Plugs

5.9 Schedule C Maintenance

Details maintenance tasks performed after 1000 hours of service.

5.10 Return To Service

Section 6 Troubleshooting

6.1 Engine Troubleshooting

Lists common engine problems and their solutions.

6.2 Controller Troubleshooting

Lists common controller issues and their solutions.

6.3 Removal From Service During Utility Outages

6.4.1 Prepare For Storage

6.4.2 Return From Storage

6.5 Attention After Submersion

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