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14 Lennox codes · 10 guides
Parts and tools for Lennox furnace codes
Drawn from the causes and steps in our 14 Lennox furnace code pages. For each part or tool you can see which Lennox codes name it. Searches that include the brand name open Amazon results and do not confirm that anything fits your model: use your model number and the part number in your manual.
Furnace flame sensor
What a furnace flame sensor does, which codes point to it, how manuals say to clean it, how to choose a replacement and how a technician tests it.
High limit and rollout switches
What furnace high limit and flame rollout switches protect, which codes mention them and why we do not link replacements.
Furnace pressure switch
What a furnace pressure switch proves, codes that point to it, why you should never jumper it, and how to choose a replacement.
Furnace inducer (draft) motor
What the inducer motor does, the codes that name it, and what to know before buying an inducer assembly.
Furnace and AC air filter
How a dirty filter triggers furnace and AC codes, how often to change it, how to read the size and what the MERV rating means.
Multimeter for appliance and HVAC diagnosis
What a multimeter measures, which manual steps call for one, how to choose one and the rules for using it safely.
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Furnace hot surface igniter
What a hot surface igniter does, the furnace codes that name it, the resistance range Trane gives, and how to choose a replacement.
Furnace control board and low-voltage fuse
What an integrated furnace control board does, the codes that name it, why a blown fuse comes first, and how to buy a board safely.
Furnace blower (circulator) motor
The furnace circulator blower motor: codes that name it, why airflow comes first, and what to know before buying a replacement.
Furnace pressure switch hose
The small hose between the inducer housing and the pressure switch: why it matters, and which codes name it.
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