What does the red light mean on my Kenmore gas furnace?

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CODE: Eight red flashes. RESULT: There’s an ignition lockout due to repeated power recycles. FIX: Check if there is low gas pressure, a dirty or defective flame sensor, or a faulty gas valve. CODE: Nine red flashes. RESULT: There’s a grounding or line polarity issue. FIX: Check the polarity at both the furnace and branch. CODE: Ten red flashes.

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