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Restriction in refrigerant system.

Compressor Cycles (Other Than Normally Satisfying Thermostat) - Refrigerant flow blockage.

Bryant · Comfort Alert Diagnostic Module

What does Restriction in refrigerant system. mean?

There is a blockage within the refrigerant lines, such as in the filter drier or metering device. This prevents proper refrigerant flow, causing the compressor to cycle abnormally.

Common Causes

  • Contamination in the system.
  • Debris in refrigerant lines.
  • Faulty filter drier.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the air filter is clean.

  2. 2

    Check for proper airflow across coils.

  3. 3

    Contact a qualified technician to diagnose and clear any restrictions in the refrigerant system.

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