DeWalt DCB118 Charger Fan Running Constantly: How to Fix It

Q: Why does my DeWalt DCB118 charger fan run constantly?

The fan runs constantly when the thermistor detects excessive heat from either a hot battery pack or high ambient temperature. This is a safety feature to prevent overheating damage.

Q: Is it safe to use the DCB118 charger when the fan runs constantly?

While the charger has safety features, constant fan operation indicates overheating conditions. Allow components to cool and ensure proper ventilation before continued use.

Q: What temperature should I charge DeWalt batteries at?

DeWalt batteries should be charged in ambient temperatures between 40°F and 105°F (4°C to 40°C) for optimal performance and safety.

Q: How long should I wait for a hot battery to cool before charging?

Allow hot batteries to cool for at least 30 minutes at room temperature before attempting to charge. The battery should feel comfortable to touch.

Q: Can I fix a faulty thermistor in the DCB118 charger myself?

No, thermistor replacement requires disassembly of the charger and is not user-serviceable. Contact DeWalt service or replace the charger if the thermistor is defective.

Abstract

When your DeWalt DCB118 charger fan runs constantly, it means the thermistor is detecting excessive heat from either a hot battery pack or high ambient temperature. This safety feature prevents damage but indicates an overheating condition that needs attention.