Lennox O23-5 Error Codes

Oil furnace · Ducted Heating

Model numbers in this family: O23-5, OF23-5, OHR23-5

• 1 Cad cell resistance 0 - 400Ohms
• 2 Cad cell resistance 400 - 800 Ohms
• 3 Cad cell resistance 800 - 1600 Ohms
• 4 Cad cell resistance >1600 Ohms
• Flashing (1/2 sec on 1/2 sec off) Lockout / Restricted Lockout
• Flashing (2 sec on 2 sec off) Recycle
• Off Flame not sensed
• On Flame sensed

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