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Poor perf - Dirty filter

Poor cooling/heating performance — Dirty air filter

Fujitsu · Air Conditioners

What does Poor perf - Dirty filter mean?

Accumulated dust and debris on the air filter can restrict airflow, significantly reducing the cooling or heating efficiency of the air conditioner.

Common Causes

  • Air filter is clogged with dust and debris from normal operation and has not been cleaned.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the air conditioner and disconnect all power supply.

  2. 2

    Clean the air filter thoroughly according to the instructions in the manual (refer to page 9).

  3. 3

    Ensure the filter is completely dry before reinstalling and resuming operation.

Browse all codes in this manual (118)
Verified technical data. Last updated: April 2026

Related Faults

11Error 11 — Serial communication error (Indoor unit not sending signal)12Error 12 — Wired Remote Controller Communication Error18Error 18 — External communication error
Source: Fujitsu Air Conditioners
Open Manual (Page 14)Search more codes in this manual