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15 Fault Code

15 Fault Code — EXT FAULT 2

Carrier · Energy Recovery Ventilators

What does 15 Fault Code mean?

The digital input configured for the second external fault is active.

Common Causes

  • External fault condition detected by digital input 2

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Identify the device or condition connected to the external fault input 2.

  2. 2

    Check the status of the external fault source.

  3. 3

    Ensure the parameter for External Fault 2 (parameter 3004) is correctly configured.

  4. 4

    Reset the VFD after clearing the external fault.

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
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