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4 Fault Code

Fault Code 4 — SHORT CIRC

Carrier · Energy Recovery Ventilators

What does 4 Fault Code mean?

A short circuit fault has been detected. This is indicated by fault current.

Common Causes

  • Short-circuit in the motor cable(s)
  • Short-circuit in the motor
  • Supply disturbances causing a short

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect motor cables for damage or shorts.

  2. 2

    Check the motor itself for internal short circuits.

  3. 3

    Verify the power supply for any disturbances.

  4. 4

    Reset the VFD after ensuring all connections are safe.

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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