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Insufficient line voltage.

Compressor Cycles (Other Than Normally Satisfying Thermostat) - Low supply voltage.

Bryant · Comfort Alert Diagnostic Module

What does Insufficient line voltage. mean?

The voltage supplied to the unit is too low, causing the compressor to struggle and cycle incorrectly. This can lead to inefficient operation and potential damage.

Common Causes

  • Issues with the power grid.
  • Undersized wiring.
  • High electrical load elsewhere in the building.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if other high-demand appliances are running at the same time.

  2. 2

    Verify the voltage at the unit's connection point (requires a multimeter and electrical knowledge).

  3. 3

    Contact an electrician or HVAC technician to investigate the power supply.

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