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GENERATORCODES

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15–20 kW standby control board

6

Engine overspeed

Engine · Shutdown

Service code 6. The display scrolls Engine Overspeed. The manual says the panel waits three seconds if output frequency is in the 65–70 Hz band, and shuts down immediately if frequency exceeds 70 Hz. Causes it lists include a failed engine part, the electronic governor, generator sense wiring, fuel delivery, the control panel, throttle linkage binding, an uncalibrated stepper, a short in the starter or rotor winding, and the AVR. Its warning: if the engine overspeeds rapidly and the governor is not bringing the throttle back after 3600 rpm, be prepared to pull the 15 amp control-panel fuse to limit damage.

Seen on: Briggs & Stratton 15 kW and 20 kW standby generator systems covered by manual 381268GS Rev. A.

Likely causes

  • Governor or stepper not controlling the throttle.
  • Throttle linkage binding.
  • Fuel delivery or AVR problems the manual includes in this chapter.

Checks an owner can do

  1. Do not restart a set that oversped.
  2. Pulling the 15 amp fuse is the manual's emergency interrupt if it is actively running away, not a repair and not something to do inside a live transfer switch.

When to call a pro

Linkage, stepper calibration, and AVR work are technician procedures. Leave the set in OFF until it is checked. To reset the service-code system, the manual says to hold OFF until the display stops scrolling the code, hold OFF at least 7 more seconds until the display turns off, leave it off at least 30 seconds, correct the cause, then hold AUTO and reinstall the 15 amp fuse if you removed it.

Source

Briggs & Stratton Service & Troubleshooting Manual, Standby Generator System 15 kW–20 kW, manual 381268GS Rev. A (service code list and the matching code chapters).

Wording follows that document. Firmware can change a threshold. If this page and the manual shipped with your unit disagree, follow the manual.

What fixed mine

No approved reports for this code yet. Send one. It stays in the review queue until it is approved.

Related Briggs & Stratton codes

https://generatorcodes.com/brand/briggs-stratton/6