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Dirty air filter.

Compressor Operates Continuously - Dirty air filter.

Bryant · Comfort Alert Diagnostic Module

What does Dirty air filter. mean?

A clogged air filter restricts airflow through the indoor unit. This forces the system to run longer to try and reach the set temperature, leading to continuous operation.

Common Causes

  • Lack of regular filter replacement.
  • Excessive dust or debris in the environment.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Locate the air filter for your indoor unit.

  2. 2

    Check if the filter is visibly dirty or clogged.

  3. 3

    Replace the filter with a new one of the correct size and type.

  4. 4

    Set a reminder to check and replace the filter regularly (typically every 1-3 months).

Browse all codes in this manual (55)
Verified technical data. Last updated: April 2026

Related Faults

ALERT LED * flashes Yellow (misreported)Yellow ALERT LED * flashes (misreported) — Welded Contactor checkALERT LED 2 flashes YellowYellow ALERT LED 2 flashes — System pressure trip or compressor overloadALERT LED 3 flashes YellowYellow ALERT LED 3 flashes — Compressor short cycling
Source: Bryant Comfort Alert Diagnostic Module
Open Manual (Page 33)Search more codes in this manual