Generac Power Systems 25 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:

C
Cynthia HerringAug 4, 2025
Why Generac Power Systems 25 kW engine will not crank?
- A
  ashley33Aug 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.
D
Deanna JacksonAug 8, 2025
What to do if Generac Power Systems Portable Generator unit shuts down during operation?
- E
  Emily WardAug 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.
S
Sierra HaynesAug 13, 2025
What to do if Generac Power Systems 25 kW engine cranks but will not start?
- A
  Alexander ShafferAug 13, 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.
J
jeffreymartinezAug 17, 2025
How to fix no AC output from Generac Power Systems 25 kW?
- R
  Rachel EstradaAug 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.
D
Daniel HenryAug 21, 2025
Why Generac Power Systems Portable Generator unit consumes large amounts of oil?
- G
  Gene HendrixAug 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.
P
Philip MoranAug 26, 2025
Why Generac Power Systems Portable Generator engine starts hard and runs rough?
- J
  James MartinAug 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.
R
Roberta HoltAug 29, 2025
What to do if Generac Power Systems 25 kW unit will not start in AUTO with utility loss?
- B
  bakerkristinaAug 29, 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 25 kW Specifications

General

Brand	Generac Power Systems
Model	25 kW
Category	Portable Generator
Language	English

Summary

Safety Information and Guidelines

Safety Information and General Hazards

Specific Hazard Warnings

Warnings for exhaust fumes, electrical shock, fire, and explosion risks.

Generator Specifications and Requirements

General Specifications

Technical details including dimensions, weights, engine system, and cooling system.

Fuel System Reconfiguration

Activation and Startup Procedures

Battery Installation and Unit Activation

Steps for installing the battery and completing the initial unit activation sequence.

Unit Activation Process

Guides the user through the initial activation sequence, including language and code entry.

Starting and Running the Engine

Operational Checks

Details checks like self-test, manual transfer switch operation, and electrical checks.

Load Testing and Automatic Operation Checks

Describes how to test the generator under load and verify automatic operation sequences.

Generator Operation and Controls

Control Panel and Operating Modes

Menu Navigation and System Settings

AlarmWarning Conditions and Timers

Transfer Switch Operation

Details on automatic sequences and manual procedures for load transfer.

Maintenance Procedures

Daily Maintenance and Break-In

Schedule A Maintenance Items

Locations and initial checks for Schedule A maintenance items.

Schedule A Maintenance Checks

Schedule A: OilFilter Replacement and Battery Checks

Schedule A: Belt, Filter, and Final Instructions

Schedule B Maintenance Items and Procedures

Schedule C Maintenance and Return to Service

Lube Oil Maintainer System

Troubleshooting Generator Issues

Engine Troubleshooting Guide

Guide to identifying and correcting engine-related problems and causes.

Controller Troubleshooting Guide

Solutions for controller alarms, warnings, and operational issues.

Service Removal and Storage Procedures

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