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Home / Generac / 1207

Evolution 1.0 / 2.0

1207

Overspeed, AVR zero-cross backup

Engine · Alarm

Alarm 1207 is the uncommon overspeed backup. The controller watches zero-cross timing from the AVR as a speed check. The table sets it for 150 milliseconds at 4500 rpm or higher, and says it is used when the controller is not seeing the normal ignition pulses.

Seen on: Air-cooled home standby generators with an Evolution 1.0 or 2.0 controller.

Likely causes

  • Ignition pulses not reaching the controller on the usual wire, so the backup speed check trips.
  • A real overspeed of about 4500 rpm.

Checks an owner can do

  1. Leave it shut down and record the code. There is no owner adjustment for this alarm.

When to call a pro

A technician has to determine whether the ignition pulse is missing or the engine actually oversped. Do not run the set while this alarm is active.

Source

Generac Diagnostic Repair Manual 10000041488 (Evolution 1.0/2.0 air-cooled). E-code rows below match that manual's alarm table as published by Home Generators for Sale and the manual text extracted from document 10000041488.

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 Generac codes

https://generatorcodes.com/brand/generac/1207