If you’re looking for help fixing your Lennox furnace, look no further! Our comprehensive Lennox furnace repair guide will explain common issues, provide troubleshooting tips, and show you how to read your model’s error codes.

CODE: LED 1-slow flashing; LED 2-continuous
PROBLEM: The high limit switch is open.

CODE: LED 1-slow flashing; LED 2-off
PROBLEM: There was a flame detected with no gas.

CODE: LED 1-off; LED 2-slow flashing
PROBLEM: Draft inducer is not operating or the pressure switch circuit has closed.

CODE: LED 1 & 2-alternating, slow flashing
PROBLEM: There’s been a flame failure.

CODE: LED 1 & 2-alternating, quick flashing
PROBLEM: The furnace does not have enough voltage.

CODE: LED 1-slow flashing; LED 2-fast flashing
PROBLEM: The flame is low.

CODE: LED 1-fast flashing; LED 2-slow flashing
PROBLEM: The furnaces polarity is reversed.

lennox furnace codes

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