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Low pressure switch tripped.

Compressor and Outdoor Fan Will Not Start - Low pressure safety tripped.

Bryant · Comfort Alert Diagnostic Module

What does Low pressure switch tripped. mean?

The system's low-pressure safety switch has activated due to insufficient pressure in the refrigerant lines, stopping the compressor and fan. This often indicates a loss of refrigerant.

Common Causes

  • Refrigerant leak.
  • Low refrigerant charge.
  • Blocked air filter or indoor coil.
  • Malfunctioning metering device.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check and replace the air filter if it is dirty.

  2. 2

    Ensure the indoor coil is clean and airflow is not obstructed.

  3. 3

    Listen for any unusual noises from the unit.

  4. 4

    Contact a qualified technician to check for refrigerant leaks and system charge.

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