Lennox Furnace Error Code LED1 FAST FLASH / LED2 FAST FLASH

Where this code is documented

7 manuals in the MyPros+ library document this code for Lennox furnace.

Models covered by the manuals that document this code

• F8AUH**-24-045
• F8AUH**-24-045X
• F8AUH**-24-060
• F8AUH**-24-075
• F8AUH**-36-060
• F8AUH**-36-060X
• F8AUH**-36-075
• F8AUH**-36-075X
• F8AUHX
• G40UH-24A-045
• G40UH-24A-045X
• G40UH-24A-070
• G40UH-36A-045
• G40UH-36A-070
• G40UH-36A-070X
• G40UH-36B-090
• G40UH-36C-110
• G40UH-48B-070
• G40UH-48B-090
• G40UH-48B-090X
• G40UH-48C-110
• G40UH-48C-135
• G40UH-60C-110
• G40UH-60C-110X

More models are covered than are listed here.

• 1Reverse line voltage polarity.
• 1 FlashFlame present with gas valve de-energized (control 103085).
• 1+2Low flame current during run mode (Board 100869).
• 1+3Flame sensed out of sequence
• 10Watchguard
• 11Pressure switch stuck closed prior to activation of…
• 2Improper Earth Ground.
• 2 FlashesPressure switch closed with combustion air inducer…