Lennox Split & Multi-Split

Lennox Error Code E439

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

What It Means

  • Compressor slowdown due to high input current.

Causes & actions from Lennox

How it shows
  • Inverter code: 12
  • Inverter LED flash code: Red 1 flash, Green 2 flashes (green: flashing ×2, red: flashing ×1)
  • Outdoor control 7-segment display: E439

This error code is primarily for informational purposes as the inverter controls the compressor to operate within design parameters. Typically the inverter will make a minor speed reduction of 4 Hz (approximately a 5-6% speed reduction) for a brief period of time and to reduce the input current and will then resume normal operation.

Other manual wording

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

Input current is approaching a high limit. Compressor speed automatically slows. The control continues sending the inverter speed demanded by the thermostat. The control sets indoor CFM and outdoor RPM to values according to demand percentage rather than the actual Hz. Alarm is automatically clear.

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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