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courtney31Aug 2, 2025
What to do if my Challenge HTJ-2027 Humidifier has a blue light but no vapor?
- JjoanfranklinAug 3, 2025
If your Challenge Humidifier shows a blue light but isn't producing vapor, first, check if there's water in the tank. If the tank is not empty, try turning up the adjustment knob. As a final step, lift off and then refit the tank to ensure it is properly connected.

