Tag: external-lockout-failed-retries

All the articles with the tag "external-lockout-failed-retries".

• Trane / American Standard 2-Blink Error Code — External Lockout Fix

  20 May, 2026

  A 2-blink code on a Trane or American Standard furnace means external lockout: the board tried three times to light the burners, failed every attempt, and...