Error code reference
Lennox Air Conditioner Error Code E424
The liquid line temperature sensor has malfunctioned (open or shorted).
The liquid line temperature sensor has malfunctioned (open or shorted).
First step from the service manual
Compare liquid line sensor resistance to temperature/resistance charts. Replace sensor pack if necessary.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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Get the full diagnostic procedure for E424.
- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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