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Blocked outdoor coil or dirty air filter.

Compressor Cycles (Other Than Normally Satisfying Thermostat) - Airflow restriction.

Bryant · Comfort Alert Diagnostic Module

What does Blocked outdoor coil or dirty air filter. mean?

The outdoor coil is blocked by debris, or the indoor air filter is dirty. This restricts airflow, causing the system to operate inefficiently and cycle improperly.

Common Causes

  • Lack of regular maintenance.
  • Environmental debris.
  • Failure to replace filters.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check and clean or replace the indoor air filter.

  2. 2

    Inspect the outdoor coil for dirt, leaves, or other obstructions and clean if necessary.

  3. 3

    Ensure there is adequate space around the outdoor unit for proper airflow.

  4. 4

    If the problem continues, contact a technician.

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