Model reference
Lennox G40DF-60C-110
Furnace
1 document12 error codes
Available documentation
Service Manual
- G40DF Series Service Literature38 pg
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Error codes (12)
CodeMeaning
LED1: Alternating Fast Flash / LED2: Alternating Fast FlashImproper main ground (sensed during ignitor warm up on controls…LED1: Alternating Slow Flash / LED2: Alternating Slow FlashWatchguardLED1: Fast Flash / LED2: Slow FlashMain power polarity reversedLED1: OFF / LED2: ONCircuit board failure or control wired incorrectly.LED1: OFF / LED2: Slow FlashProve switch open, or blocked inlet/exhaust vent, or prove switch closed prior…LED1: ON / LED2: OFFFlame sensed without gas valve energized (duplicate indication with…LED1: ON / LED2: ONCircuit board failure or control wired incorrectly.LED1: ON / LED2: Slow FlashFlame sensed without gas valve energized, or rollout switch open, or 24V pin…LED1: Simultaneous Fast Flash / LED2: Simultaneous Fast FlashNormal operationLED1: Simultaneous Slow Flash / LED2: Simultaneous Slow FlashPower onLED1: Slow Flash / LED2: Fast FlashLow flame signalLED1: Slow Flash / LED2: ONPrimary or secondary limit switch openRelated Lennox furnace models
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