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.
How do I return a generator to automatic mode after service?
Performing generator maintenance safely requires removing power from both the generator and the control panel. After completing maintenance on a standby generator, it’s important to follow the correct steps to restore power to the unit. If this process is skipped or done out of order, the generator's control panel may show READY TO RUN, but won’t operate as expected during a power outage.
Important: For your generator to operate automatically during a power outage, all of the following must be in place:
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AUTO mode is engaged.
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On Next Gen Series generators, the AUTO button will be lit.
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On Guardian Series generators, the display will read READY TO RUN.
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The status light is illuminated green.
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The 7.5A fuse is installed in the control panel.
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The generator MLCB (Main Line Circuit Breaker) is set to ON (CLOSED).
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The battery is connected and functional.
To learn more about regularly scheduled maintenance for home standby generators, see here:
To learn more about safely powering your generator down before beginning maintenance, see here: What Safety Precautions Should I Take When Performing Maintenance on My Generator?
Environment
This article applies to:
- Generac Next Generation Series 10-28 kW air-cooled standby generators
- Generac Guardian Series 10-26 kW air-cooled generators (2017 to present)
IMPORTANT: To avoid potential damage, always follow proper procedures when shutting down or restarting your generator under load (during a power outage). If the generator has been running continuously, refer to this article before turning it back on: How Do I Shut Down My Generator When It’s Powering My House (During an Outage)?
Procedure
Any time maintenance is performed on a standby generator, the unit should be turned OFF and the MLCB (main line circuit breaker) should be turned OFF.
Return the generator to AUTO during normal conditions (utility power present)
1. Perform required maintenance procedures.
2. Clear the maintenance reminder alarm:
3. Reinstall the intake side panel and front panel, if removed.
4. Reinstall the 7.5A fuse in the control panel.
5. If prompted, complete the Install Wizard setup.
Note: For more information about the Install Wizard message, see here.
6. Press the AUTO button on the control panel. The side status light should turn solid green, indicating the generator is in AUTO mode. Once in AUTO mode, the generator will:
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Run the exercise at the scheduled time, provided utility power is available.
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Start automatically during a power outage. Step 6 must
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On Next Gen Series generators, the AUTO button will be lit.
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On Guardian Series generators, the display will read READY TO RUN.
Note: For more information about the Install Wizard message, see here.
7. Set generator MLCB (Main Line Circuit Breaker) to ON (CLOSED). So that the generator can send power to the house when needed.
8. Close and lock the generator's lid.
Return the generator to AUTO during a utility outage
1. Perform required maintenance procedures.
2. Clear the maintenance reminder alarm:
3. Reinstall the intake side panel and front panel if removed.
4. Reinstall the 7.5A fuse in the control panel.
5. If prompted, complete the Install Wizard setup.
Note: For more information about the Install Wizard message, see here.
6. Press the AUTO button on the control panel. Allow the unit to run for one minute with no load (MLCB set to OFF).
Note: Unless utility power is present, the generator will start its engine and run until utility power is detected.
7. Set generator MLCB (generator disconnect) to ON (CLOSED)
Note: Once the generator detects utility power it will perform its usual shutdown process.
Additional considerations
Clearing maintenance reminders (yellow status light)
- If returning the unit to service after performing maintenance, you may need to clear one or more maintenance alarms. Follow these steps:
Error code 2800 (auxiliary shutdown)
Install wizard after battery disconnection:
- If the generator battery was disconnected during service, the control panel will launch the Install Wizard once power is restored. This is normal. Follow the on-screen prompts to set the language, time, Quiet Test mode, and exercise schedule.
Reconnecting to Wi-Fi
See also
