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GENERATORCODES

Home / Generac / 1900

Evolution 1.0 / 2.0

1900

Undervoltage, prolonged

Electrical · Alarm

Alarm 1900 is prolonged under-voltage from loss of voltage. The e-code table describes voltage below 80 percent for more than about 10 seconds.

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

Likely causes

  • The set could not hold voltage under load.
  • A loss of excitation or sensing the table groups under loss of voltage.

Checks an owner can do

  1. Turn the generator breaker off and remove large loads before anyone restarts it.
  2. Do not measure live output unless you are qualified to do that.

When to call a pro

The diagnostic manual routes under-voltage through the output-voltage tests. That is technician work, especially if the set is trying to excite the field.

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/1900