Lennox Furnace Error Code LED1 Fast Flash / LED2 Fast Flash (Simultaneous)

Where this code is documented

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

Models covered by the manuals that document this code

• G23Q2(X)-50
• G23Q2/3(X)-75
• G23Q3(X)-100
• G23Q3(X)-50
• G23Q3/4(X)-100
• G23Q3/4(X)-125
• G23Q4/5(X)-100
• G23Q4/5(X)-75
• G23Q5/6(X)-125
• G23Q5/6(X)-150
• G41UF-24B-045
• G41UF-36B-045
• G41UF-36B-070
• G41UF-36C-090
• G41UF-48C-090
• G50DF-24A-045
• G50DF-24A-045X
• G50DF-24A-070
• G50DF-36A-070
• G50DF-36A-070X
• G50DF-36B-090
• G51MP-24B-045
• G51MP-36B-045
• G51MP-36B-070

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…