Generac GT-990 — Manual Shutdown and Retransfer Back To Utility

Operation · Transfer Switch / Generator

For the Generac GT-990, from the Generac service manual.

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Procedure

1. Set generator main line circuit breaker to OFF.
2. Let generator run at no-load for a few minutes to cool.
3. Set AUTO-OFF-MANUAL switch to OFF; wait for engine to stop.
4. Turn off utility power supply to transfer switch.
5. Manually actuate transfer switch to UTILITY source side.
6. Turn on utility power supply to transfer switch.
7. Set AUTO-OFF-MANUAL switch to AUTO.

Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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