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A404 — Fire Shutdown

A404 — Fire Shutdown — Smoke Detected

Carrier · Energy Recovery Ventilators

What does A404 — Fire Shutdown mean?

The unit has shut down because smoke has been detected by a smoke detector.

Common Causes

  • Smoke detected by a smoke detector

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Investigate the source of smoke detection immediately.

  2. 2

    Ensure the area is safe.

  3. 3

    Address the cause of the smoke.

  4. 4

    Manually reset the unit after the smoke condition is cleared.

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