Humidifier will not power on at all; no lights or display even when plugged into a known-good outlet.

Safety first: Unplug the unit before opening any covers. If you smell burning or see melted plastic, discontinue use and consider professional service.

• Step 1 – Verify outlet: Plug a lamp or other appliance into the same outlet to confirm it has power.
• Step 2 – Inspect power cord: Check the AIRCARE power cord for cuts, kinks, or burn marks. If damaged, replace the cord; do not tape or splice it.
• Step 3 – Check power switch: On models with a mechanical rocker switch, ensure it clicks firmly. A loose or broken switch may need replacement.
• Step 4 – Access control board (advanced): Remove the housing to access the main PCB. Look for an onboard fuse (glass or blade type). If blown, identify and correct the cause (shorted motor, etc.) before replacing with the same rating.
• Step 5 – Inspect for burnt components: If the board shows burnt spots or swollen components, replace the entire control board with the correct AIRCARE part.

If you are not comfortable working around mains voltage, have a qualified technician diagnose and repair the power circuit.