Crane ultrasonic humidifier displays E3 and shuts off mist output shortly after starting.

Safety first: Unplug the humidifier and allow it to cool for at least 15 minutes before inspection.

• 1. Check water level and seating:
  • Ensure the tank is full and properly seated on the base.
  • Verify the tank cap and valve are not clogged so water can flow into the base reservoir.
• 2. Clean the base and transducer:
  • Empty the base and wipe out any sludge or mineral deposits.
  • Use a soft cloth or cotton swab with white vinegar to gently clean the ultrasonic transducer disc.
  • Do not use sharp tools that can scratch the disc.
• 3. Clear air vents:
  • Inspect the underside and sides of the base for dust-clogged vents.
  • Use a soft brush or vacuum with a brush attachment to clear vents.
• 4. Inspect thermal sensor:
  • If accessible, locate the NTC sensor or thermal fuse near the transducer or heater area.
  • Check for loose wiring or corrosion on connectors.
• 5. Test operation:
  • Reassemble, refill, and run on low mist first.
  • If E3 returns quickly even with proper water level and clean vents, the thermal sensor or control board may be faulty and require replacement.