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3 Red Flashes

3 Red Flashes — Flame Sense Fault

Carrier · Energy Recovery Ventilators

What does 3 Red Flashes mean?

The control sensed a flame when the gas valve should be closed. The indoor fan and inducer will be on.

Common Causes

  • Flame sensor wiring issue
  • Gas valve is not operating correctly
  • False flame detection

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the wiring for the flame sensor.

  2. 2

    Verify the gas valve is operating as expected.

  3. 3

    Ensure the flame sensor is clean and properly positioned.

  4. 4

    Reset the unit's power to clear the 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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