Understanding the Interface on GB251+
1. Internal Battery Level
Indicates the charge level of the internal battery.Learn More.
2. Error LED
Illuminates red if reverse polarity is detected, or blinks “on” and “off” in various sequences (from 1 to 6 blinks) to convey error conditions.
3. Hot LED
Illuminates solid red; unit is fully operational, but approaching upper temperature limit. Flashing red; unit is too hot to jump start, only the flashlight is available in this state.
4. Cold LED
Illuminates solid blue; unit is fully operational, but approaching lower temperature limit. Flashing blue; unit is too cold to jump start, only the flashlight is available in this state.
5. Power Button
Push to turn unit "on" & "off".
6. Power LED
Illuminates white when unit is "on". Will illuminate orange after the 60-second timeout countdown until the clamps are removed from the Car Battery or the GB251 is power cycled 'off' and back 'on' again.
7. Light Mode Button
Toggles the ultra-bright LED light through 7 light modes: 100% > 50% > 10% > SOS > Blink > Strobe > Off
8 . Voltmeter/Countdown Timer
The built-in voltmeter reads the voltage of the vehicle’s battery for enhanced diagnostics and troubleshooting. The voltmeter will automatically read the voltage of any battery (or battery system) when the battery clamps are connected - even if the unit is powered off. The voltmeter will read voltage between ~3V to ~30V. If the connected battery is below 3V, nothing will display. In this situation, it is likely there is a load(s) on the battery, such as, headlights or an AC fan that should be shut off before attempting to start the vehicle. While the unit is on and after a battery is detected, the voltmeter will display the 60-second timeout countdown.
9. Boost LED
Illuminates white when boost is active. If the unit is connected properly to a battery, the GB251 will automatically detect a battery and go into boost mode (LED flashes white when manual override feature is active).
10. Manual Override Button
To enable, push and hold for three (3) seconds. WARNING: Disables safety protection and manually forces boost "on". Only for use when a battery voltage is too low to be detected.Learn More.
8 AM to 7 PM EST
The NOCO Company 30339 Diamond Parkway #102 Glenwillow, OH 44139-5400 United States of America
