Error code reference
Lennox Air Conditioner Error Code E180
The outdoor unit ambient temperature sensor has malfunctioned; outdoor unit control will not perform low…
The outdoor unit ambient temperature sensor has malfunctioned; outdoor unit control will not perform low ambient cooling.
First step from the service manual
Compare outdoor 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 E180.
- 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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