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Troubleshooting
Error Reason/Solution
Cold LED: Flashing
Flashing Red
Solid Red
Cold LED: Solid
Hot LED: Flashing
Hot LED: Solid
Double (2) Flash
Triple (3) Flash
Quadruple (4) Flash
Sextuple (6) Flash
Single (1) Flash
Solid Red
Reverse polarity detected. / Reverse the battery connections.
Short circuit detected on battery clamps. / Remove all loads, reconnect clamps to battery.
Connected Charger is Incompatible. / Unplug USB Cable, Turn O/On the Unit, Use Dierent Charger.
If charging the unit, check the cable or charger for damage / If charging a USB-C device, check cable or device for damage /
If problem persists, contact NOCO support.
Unit is fully operational, but approaching lower temperature limit. / Allow the unit to warm up.
Unit is too cold to jump start, only the flashlight is available in this state / Allow the unit to warm up.
Unit is too hot to jump start, only the flashlight is available in this state. / Allow the unit to cool.
Unit is fully operational, but approaching upper temperature limit. / Allow the unit to cool.
High voltage detected at clamps (the GBX155 is connected to a voltage system greater than 12V, such as 24V).
Bad battery cell detected. / When an internal battery cell has failed during charging.
Charge timeout error (i.e. the GBX155 has been in bulk charge for too long).
Back-Charge detected into the GBX155 through the clamps while in a Boost Mode (i.e. the GBX155 is in Manual Override
and then connected to a system greater than 12V, such as 24V).
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