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8 Red Flashes

8 Red Flashes — Internal Control Lockout

Carrier · Energy Recovery Ventilators

What does 8 Red Flashes mean?

The IGC has detected an internal hardware or software error. No gas heating will occur.

Common Causes

  • Internal hardware error in the IGC
  • Internal software error in the IGC

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reset the 24v power to the unit.

  2. 2

    If the fault persists after resetting power, replace the IGC board.

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 56)Search more codes in this manual