Error code reference
Lennox Air Conditioner Error Code E410
The outdoor unit low pressure switch has closed indicating unit pressure is below the lower limit.
The outdoor unit low pressure switch has closed indicating unit pressure is below the lower limit.
First step from the service manual
Confirm system is properly charged with refrigerant. Check TXV, indoor unit blower motor, dirty filters or clogged refrigerant filter. Confirm evaporator coil is clean.
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 E410.
- 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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