Lennox ML180UH Error Codes

Equipment type not specified · Ducted Heating

• 1 Flash Flame present with gas vavle de-energized.
• 2 Flashes Pressure switch closed with combustion air inducer de-energized.
• 3 Flashes Pressure switch open with combustion air inducer energized.
• 4 Flashes Primary limit switch open.
• 5 Flashes Rollout switch open.
• 6 Flashes Pressure switch cycle lockout.
• 7 Flashes Lockout, burners fail to light.
• 8 Flashes Lockout, burners lost flame too many times.
• 9 Flashes Line voltage polarity incorrect.
• LED Off No power to control or control harware fault detected.

Reference only. Confirm against the manual for your exact model. Data release 105f66ecb9e96e5dc473025d.