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A163

A163 — Circuit A Down Due to Failure Lockout

Carrier · Energy Recovery Ventilators

What does A163 mean?

Circuit A is locked out due to accumulating three strikes or another alarm condition.

Common Causes

  • Circuit A has accumulated 3 fault strikes
  • Another alarm has locked out Circuit A

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Review recent alarms and fault codes for Circuit A.

  2. 2

    Address any outstanding issues indicated by previous faults.

  3. 3

    Perform a service test for Circuit A if applicable.

  4. 4

    Reset the lockout condition after resolving the underlying cause.

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