Error code reference
Lennox Air Conditioner Error Code E436
Inverter heat sink temperature exceeded limit (inverter code 62).
Inverter heat sink temperature exceeded limit (inverter code 62).
First step from the service manual
Tighten screws that hold the heat sink to the inverter control board. Wait five minutes to allow capacitor to discharge before checking screws.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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- 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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