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Unit undersized for load.

Compressor Operates Continuously - Unit too small for the space.

Bryant · Comfort Alert Diagnostic Module

What does Unit undersized for load. mean?

The heating or cooling capacity of the unit is insufficient for the size of the area it is intended to condition. It must run constantly to try and meet the demand.

Common Causes

  • Incorrect initial sizing of the unit.
  • Increased heat load in the building (e.g., more occupants, new equipment).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure doors and windows are closed properly.

  2. 2

    Check for any new heat-generating sources within the conditioned space.

  3. 3

    Consider reducing the heat load by improving insulation or blocking unused areas.

  4. 4

    Consult with an HVAC professional about whether the unit is appropriately sized for the load.

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