Charger Fault Light
Milwaukee Power Tool Charger
Severity: ModerateWhat Does This Error Mean?
Milwaukee charger fault light means the battery temperature is out of range or the battery has failed. Remove the battery, wait 30 minutes, clean the contacts, and retry.
How to Fix It
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Read the LED pattern
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Allow temperature normalisation
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Clean the contacts
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Test the charger with a different battery
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Check for swelling
Frequently Asked Questions
What does alternating red and green on a Milwaukee charger mean?
Alternating red and green lights on a Milwaukee charger typically indicate a defective battery — the battery management system has flagged a cell fault. The battery is at end of life.
Can I force a Milwaukee battery to charge past a fault light?
No — and you should not attempt to. The fault light is a safety response from the battery management system. Forcing charge on a flagged battery risks thermal runaway.
How do I know if my Milwaukee charger is the problem?
Test the charger with two or three different Milwaukee batteries. If all batteries show a fault on this charger but charge normally on another, the charger is faulty.