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Home / Generac / 1600

Evolution 1.0 / 2.0

1600

Underspeed

Engine · Alarm

Alarm 1600 is underspeed. The e-code table describes an overloaded 60 Hz unit at about 55 Hz for 30 seconds (about 40 Hz on a 50 Hz unit). It also lists low fuel supply or a throttle-control problem slowing the engine.

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

Likely causes

  • Too much load for the set, so engine speed falls.
  • Fuel supply running short.
  • Throttle control not holding governed speed.

Checks an owner can do

  1. Shut off large 240 V loads, especially air conditioners, before a restart.
  2. Confirm fuel is on and the LP tank is not empty.

When to call a pro

If it still will not carry a modest load, the throttle control and fuel system need a technician. Do not adjust the mixer screws.

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/1600