Lennox Split & Multi-Split

Lennox Split & Multi-Split Error Code 45

Split & Multi-Split: Heat pump (outdoor)

What It Means

  • System low pressure protection

Causes & actions from Lennox

How it shows
  • el18kslv outdoor fault display: 45
  • el18kslv pcb fault led: 45

The minimum temperature of indoor pipe Tm and outdoor Ts <-45 ℃ at cooling mode or minimum temperature outdoor Tc and outdoor Te <-50 ℃at heating mode

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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