Read the manual thoroughly and understand all of the instructions, cautions, and warnings before using this equipment. If any section of the manual is not understood, contact your nearest authorized dealer, or contact Generac Customer Service at 1-888-436-3722 (1-888-GENERAC), or www.generac.com with any questions or concerns.
Charger Warning: Error code 2770
Environment
This error applies to error code 2760, BATTERY PROBLEM, for air-cool home standby generators.
Note: The term "error code" is used interchangeably with 'alarm code,' 'fault code,' 'fault alarm' and similar terminology. Error code applies to all such terminology.
Overview
- Error Codes: 2770
- Alarm: CHARGER WARNING
- Issue: Battery is not charging.
- Cause: Blown T1 fuse, charging circuit issue.
What can I do?
- Your options are limited beyond performing basic checks on components and verifying that everything appears normal. You can attempt to clear the alarm and manually restart the unit.
- Sometimes, clearing the alarm and attempting to restart the unit is all that is needed, as the alarm may be a one-time occurrence that does not indicate a persistent issue.
Note: Generac support does NOT recommend end users attempt to modify or service internal generator wiring. Generac independent authorized service dealers are trained to service Generac generators and can be contacted using the dealer lookup tool on Generac.com: https://www.generac.com/dealer-locator
When should you contact a Generac Independent Authorized Service Dealer (IASD)?
- If issues persist after performing the checks and attempting to restart, contacting a Generac IASD for diagnosis is strongly recommended.
General troubleshooting
What it indicates: This alarm signals when the battery voltage is below 12.5 volts at the end of an 18-hour charge cycle, indicating the battery isn’t charging properly.
Checks to perform
- Check battery health at the generator's controller.
- Check charging connections at the battery terminals are secure.
- Check for corrosion on the battery connections or terminals.
Troubleshooting next steps
Contact a Generac Independent Authorized Service Dealer (IASD) to professionally diagnose the issue. An IASD may perform the following troubleshooting steps:
1. Check Charger Connections: Ensure the charging circuit is correctly connected and has proper voltage.
2. Assess Battery Health: Test the battery's charge retention. If the battery is healthy, the issue might be with the charging system.
