Lennox Split & Multi-Split

Lennox Error Code E435

Split & Multi-Split: Air conditioner (outdoor), Heat pump (outdoor)

What It Means

  • Inverter internal error.

Causes & actions from Lennox

How it shows
  • Inverter code: 60
  • Inverter LED flash code: Red 6 flashes, Green OFF (green: off, red: flashing ×6)
  • Outdoor control 7-segment display: E435

When this error occurs, the outdoor control cycles power to the inverter by opening the contactor for two minutes. Check that the EEPROM is properly seated. After power is cycled to the inverter 3 times, the outdoor unit is locked out. If problem persists, replace the inverter.

Other manual wording

EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060, EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060, EL19KPV,…

When this error occurs, the outdoor control will cycle power to the inverter by opening the contactor for 2 minutes. Check that the EEPROM is properly seated. After power is cycled to the inverter 3 times, the outdoor unit is locked out.

Applicable models & manual sources
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.

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