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D18 Green LED

D18 Green LED lit — ERV Blower Status Alarm

Carrier · Energy Recovery Ventilators

What does D18 Green LED mean?

This indicates a blower or fan failure. The unit may not be able to move air effectively.

Common Causes

  • Fan motor failure
  • Obstruction in the fan or ductwork
  • Wiring issue to the fan motor
  • Overheating of the fan motor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the fan blades for obstructions and ensure they spin freely.

  2. 2

    Check the fan motor for any signs of damage or overheating.

  3. 3

    Verify all electrical connections to the fan motor.

  4. 4

    Reset the system after addressing the issue.

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 67)Search more codes in this manual