What It Means
- Could be one of the following: • Indoor and outdoor unit communication error. • Outdoor unit temperature sensor error. • Outdoor unit EEPROM error • Compressor top temperature switch is open.
Lennox Split & Multi-Split
Lennox Error Code Flash Flash / Off / ON
Split & Multi-Split: Mini-split unit (outdoor)
Causes & actions from Lennox
How it shows
- corp1816 single zone led 018 030: Flash Flash / Off / ON
Could be one of the following: Indoor and outdoor unit communication error; Outdoor unit temperature sensor error; Outdoor unit EEPROM error; Compressor top temperature switch is open (Main Control Blue or Yellow LED: Flash Flash; IPM Control Red LED: Off, Green LED: ON)
Applicable models & manual sources
- MPA
Could be one of the following: • Indoor and outdoor unit communication error. • Outdoor unit temperature sensor error. • Outdoor unit EEPROM error • Compressor top temperature switch is open.
MPA, MPB, MLA
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.
What should you check next?
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