Lennox Furnace Error Code SIMULTANEOUS SLOW FLASH

Where this code is documented

1 manual in the MyPros+ library documents this code for Lennox furnace.

Models covered by the manuals that document this code

• G43UF-24B-045
• G43UF-24B-070
• G43UF-36B-070
• G43UF-36C-090
• G43UF-36C-090H

• 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…