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A157

A157 — A/D Hardware Failure

Carrier · Energy Recovery Ventilators

What does A157 mean?

The Analog-to-Digital (A/D) hardware has failed, resulting in a unit shutdown.

Common Causes

  • Software failure

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Attempt a system reset.

  2. 2

    Ensure the unit's firmware is current.

  3. 3

    Contact technical support for hardware diagnosis.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

1 Fault CodeFault Code 1 — OVERCURRENT10 Fault CodeFault Code 10 — PANEL LOSS11 Fault Code11 Fault Code — ID RUN FAIL
Source: Carrier Energy Recovery Ventilators
Open Manual (Page 47)Search more codes in this manual