Model reference

Lennox G24M2-60

Furnace

1 document20 error codes

Available documentation

Service Manual

G24 Series Service Literature36 pg
Covers this model

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Test values, resistance specs, and wiring references
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2 Flashes (RAM) on my Lennox G24M2-60

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Control lockout — failed to sense or

From Service Manual 654537, p.29:

1.Access service mode to confirm the active fault code and read stored error history.

2.Measure door lock assembly resistance across PTC terminals. Expected: ~200 ohms cold.

3.Inspect strike and latch alignment. A misaligned strike prevents the switch stack from closing.

Part W10810403

Door lock assembly

Error codes (20)

CodeMeaning

2 Flashes (RAM)Control lockout 3 Flashes (RAM)Pressure switch open 4 Flashes (RAM)Open limit 5 Flashes (RAM)Flame sensed and gas valve not energized.Fast Flash (RAM)Normal operation with call for heat (RAM control).LED#1 Alternating Fast Flash / LED#2 Alternating Fast FlashImproper main ground or line voltage below 75 volts; or broken ignitor; or open…LED#1 Alternating Slow Flash / LED#2 Alternating Slow FlashWatchguard LED#1 Fast Flash / LED#2 Slow FlashMain power polarity reversed LED#1 OFF / LED#2 ONCircuit board failure or control wired incorrectly.LED#1 OFF / LED#2 Slow FlashPressure switch open or has opened 5 times during a single call for heat; or…LED#1 ON / LED#2 OFFCircuit board failure or control wired incorrectly.LED#1 ON / LED#2 ONCircuit board failure or control wired incorrectly.LED#1 ON / LED#2 Slow FlashRollout switch open or 9-pin connector improperly attached.LED#1 Simultaneous Fast Flash / LED#2 Simultaneous Fast FlashNormal operation LED#1 Simultaneous Slow Flash / LED#2 Simultaneous Slow FlashPower on, normal operation; also signaled during cooling and continuous fan.LED#1 Slow Flash / LED#2 Fast FlashLow flame signal LED#1 Slow Flash / LED#2 OFFFlame sensed without gas valve energized.LED#1 Slow Flash / LED#2 ONPrimary or secondary limit open; limit must close within specified trials/time…Slow Flash (RAM)Normal operation, no call for heat (RAM control).Steady ON (RAM)Control board failure (RAM control).

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