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Home / Honeywell / 1200

Sync 2.0 / 3.0 (Evolution e-codes)

1200

Overspeed, prolonged

Engine · Alarm

Gentek's guide describes 1200 as prolonged overspeed: 72 Hz or above for 3 seconds on a 60 Hz unit, or 60 Hz or above on a 50 Hz unit. The likely cause it names is the stepper motor or mixer assembly, including a connector that came unplugged or a mixer that jammed.

Seen on: Honeywell Sync 2.0 and 3.0 home standby controllers. Gentek's Evolution fault guide says this e-code list applies to those Sync controllers because they use the Generac Evolution control.

Likely causes

  • Stepper motor or mixer unplugged or jammed.
  • Anything else that raises engine speed into that range.

Checks an owner can do

  1. Leave the set shut down. Do not adjust mixer screws.

When to call a pro

Stepper and mixer diagnosis is technician work. This is the overspeed code. It is not 1300.

Source

Gentek Power Generac Evolution 1.0/2.0 fault guide (November 2018), which states the same e-code list applies to Honeywell Sync 2.0/3.0. Meanings below are limited to rows quoted from that guide.

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 Honeywell codes

https://generatorcodes.com/brand/honeywell/1200