Garmin G1000 Nav III Error GMU1

G1000 Nav III · taken from the manufacturer’s manual, pages cited

Fault codeGMU1

The system has detected an incorrect software version loaded in the GMU 44 indicates a software mismatch in this component, requiring loading the correct software version. The manual's first action is: “Load correct software version in the GMU 44.”

Model
Garmin G1000 Nav III
Display shows
GMU1
Type
Fault code
Source
Manual p. 86

What GMU1 means

The system has detected an incorrect software version loaded in the GMU 44. p. 86

Common causes

  • The system has detected an incorrect software version loaded in the GMU 44. p. 86

What to do

  1. Load correct software version in the GMU 44. p. 86

Before you service the product, read the safety instructions in the manual p. 4.

If GMU1 is still not resolved

  • Contact service / dealer p. 3
    “KEEP AWAY FROM LIVE CIRCUITS. Maintenance personnel shall ob serve all safety regulations at all times.”
  • Contact service / dealer p. 127
    “Loading the wrong software into GIA63/63W units may cause an inoperable condition that is not covered by warranty .”
Open the manual at page 86 All G1000 Nav III error codes Manual details & download

This page summarises what the manufacturer’s manual says about GMU1; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Garmin. Found a mistake? Report an error.