Lennox Mini-Split Service Manual / Page 141
Multi-Zone outdoor units display fault codes with a digital LED display on the main board. The main board is
accessed through the top of the unit. Indoor units will display more detailed fault codes. See Section 13.4 for
troubleshooting indoor unit fault codes
DISPLAY
OUTDOOR UNIT ERROR CODE DEFINITION
Outdoor EEPROM error
E0
Communication error between outdoor unit and all indoor units
E2
Communication error between outdoor unit main control
and IPM control
E3
Temp. sensor error (outdoor coil sensor, outdoor ambient sensor,
compressor discharge sensor, indoor unit coil outlet temp. sensor)
E4
High or Low voltage protection
E5
Outdoor DC fan speed error
E8
F1
Indoor unit #1 coil outlet temp. sensor error
F2
Indoor unit #2 coil outlet temp. sensor error
F3
Indoor unit #3 coil outlet temp. sensor error
F4
Indoor unit #4 coil outlet temp. sensor error
F5
F6
Indoor unit #5 coil outlet temp. sensor error
Indoor unit #6 coil outlet temp. sensor error
P1
High pressure switch open
P2
Low pressure switch open
P3
Outdoor Compressor current overload sensed
P4
High temperature sensed at compressor discharge line
P5
High temperature sensed at outdoor coil
P6
Inverter module (IPM) error
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