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15–20 kW standby control board

1

Low battery voltage

Electrical · Warning

Service code 1. The display scrolls Low Battery Voltage (the same chapter also describes Battery Charge Circuit). The manual says the LED blinks once, then pauses, and that this happens when battery voltage drops below the preset value. The listed causes are a blown fuse in the transfer switch, a blown fuse in the generator control panel, a failed battery, a parasitic drain, or a failed trickle charger. The charger is a float charger and will not revive a completely dead battery, which also cannot power the display.

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

Likely causes

  • Failed or discharged battery.
  • Blown 15 amp control fuse, or a blown transfer-switch fuse.
  • Parasitic drain or a failed trickle charger.

Checks an owner can do

  1. The manual's battery test starts with OFF, then removing the 15 amp fuse and the transfer-switch fuses before disconnecting the battery. Do not pull transfer-switch fuses unless you are qualified to be in that equipment.
  2. A battery that is only discharged can be charged with the method the battery maker specifies. The replacement the manual calls for is a 12 V battery of the size in the installation manual.

When to call a pro

Fuse diagnosis inside the transfer switch, and a charger that will not maintain a charged battery, are technician jobs. 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/1