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A3

Boneco Humidifier

Severity: Moderate

Source: OnlyErrorCodes.com — Every error code. One place.

Boneco Humidifier A3 — Filter Clean Required

What Does This Error Mean?

A3 on a Boneco humidifier means the evaporative wick filter needs cleaning or has reached the end of its service life and needs replacement. Remove the filter, clean or replace it, then reset the A3 counter.

Affected Models

  • Boneco H680
  • Boneco H300
  • Boneco H400
  • Boneco H700
  • Boneco Air-O-Swiss 7531

Common Causes

  • Evaporative wick clogged with mineral deposits from hard water
  • Filter reached the end of its rated service life (typically 6–8 weeks)
  • Filter contaminated with dust or biological growth from infrequent cleaning

How to Fix It

  1. Switch off, unplug, and remove the water tank.

  2. Access and remove the filter.

    The evaporative wick filter sits inside the base or a dedicated filter compartment. Refer to your Boneco manual for the exact location on your model. Lift or slide the filter out.

  3. Assess whether to clean or replace.

    Hold the filter up to light. If it is moderately scaled but structurally intact, it can be cleaned. If it is heavily scaled, brittle, torn, or has visible mould, replace it. Boneco recommends replacing the filter every 6–8 weeks in typical use.

  4. Clean the filter if not replacing.

    Soak the filter in a solution of cold water and white vinegar (50/50) for 30–60 minutes. Do not wring or scrub — wick filters are fragile. Rinse gently with cold water and allow to air dry.

  5. Reset the A3 counter.

    After reinstalling a clean or new filter, press and hold the filter reset button (varies by model — typically a small button near the filter compartment or accessed via the menu) until the A3 alert clears.

Frequently Asked Questions

Where can I buy a replacement Boneco filter?

Boneco replacement filters (model A401, A450, or others depending on your humidifier model) are available from Boneco's website, Amazon, and home appliance retailers. Match the filter model number to your humidifier model.

Does A3 prevent the humidifier from running?

On most Boneco models, A3 is a reminder alert — the humidifier continues to run but with reduced efficiency. However, a severely clogged filter significantly reduces mist output. Replace or clean the filter promptly.