Evolution 1.0 / 2.0
1800
Overvoltage, prolonged
Electrical · Alarm
Alarm 1800 is the prolonged over-voltage shutdown in the Evolution e-code table. The row does not add a homeowner cause beyond the over-voltage condition itself. The manual's separate protection logic describes fast and slow over-voltage thresholds, but those percentages are not printed on the 1800 row, so they are not stated here as the definition of 1800.
Seen on: Air-cooled home standby generators with an Evolution 1.0 or 2.0 controller.
Likely causes
- The alternator output stayed above the controller's prolonged over-voltage limit.
- A regulator or sensing problem the table does not break out by part number.
Checks an owner can do
The cited source does not list a homeowner check for this fault. Leave the set off and use the note below.
When to call a pro
Leave the breaker off and the mode in OFF. Over-voltage can damage connected equipment. Regulator and sensing tests are dealer procedures.
Source
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/1800