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9 Fault Code

Fault Code 9 — MOT OVERTEMP

Carrier · Energy Recovery Ventilators

What does 9 Fault Code mean?

The drive estimates that the motor is too hot. This can be due to overload or incorrect parameter settings.

Common Causes

  • Overloaded motor
  • Incorrect parameters for motor temperature estimation
  • Faulty temperature sensors

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the motor for signs of overload.

  2. 2

    Adjust the parameters used for motor temperature estimation.

  3. 3

    Verify the temperature sensors and related parameters (Group 35) are correct.

  4. 4

    Allow the motor to cool down.

  5. 5

    Reset the VFD after addressing the potential 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 126)Search more codes in this manual