Lennox MMA048S4 User Manual

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20. Error Codes
The error code display is located on the main controller board of all multi-zone outdoor units.
Table 10. MLB and MPC Multi-Zone Outdoor Unit
Error Codes
Display Malfunction and Protection Indication
EL01
Communication malfunction between indoor and
outdoor units.
FL14
Capability mismatch between indoor unit and outdoor
unit
EC50 Outdoor temperature sensor error.
EC51 Outdoor EEPROM error.
EC52 Condenser coil temperature sensor (T3) malfunction.
EC53 Outdoor ambient temperature sensor (T4 ) malfunction.
EC54
Compressor discharge temperature sensor TP is in
open circuit or has short circuited
EC55 Outdoor IPM module temperature sensor malfunction
EC56 Outdoor T2B sensor error.
EC57 Refrigerant pipe temperature sensor error.
EC07
Outdoor DC fan motor malfunction/fan speed out of
control.
EC71 Over current failure of outdoor DC fan motor.
EC72 Lack phase failure of outdoor DC fan motor.
PC00 Inverter module (IPM) protection.
PC02 Top temperature protection of compressor.
PC06 Discharge temperature protection of compressor.
PC08 Outdoor over-current protection.
PC0A High temperature protection of condenser.
PC0F PFC module protection.
PC0L Low temperature protection of outdoor unit.
PC10 Outdoor unit low AC voltage protection.
PC11
Outdoor unit main control board DC bus high voltage
protection.
PC12
Outdoor unit main control board DC bus high voltage
protection / 341 Machine Check Error (MCE) error.
PC30 System high pressure protection
PC31 System low pressure protection
Table 10. MLB and MPC Multi-Zone Outdoor Unit
Error Codes
Display Malfunction and Protection Indication
PC40
Communication error between outdoor main chip and
compressor driven chip
PC42 Compressor start failure of outdoor unit
PC43 Outdoor compressor lack phase protection
PC44 Outdoor unit zero speed protection
PC45 Outdoor unit IR chip drive failure
PC46 Compressor speed has been out of control
PC49 Compressor over-current failure
PCA1 Condensation protection of refrigerant pipe
PH90 High temperature protection of Evaporator
PH91 Low temperature protection of Evaporator
LC06 High temperature protection of Inverter module (IPM)

Lennox MMA048S4 Specifications

General

Brand	Lennox
Model	MMA048S4
Category	Air Conditioner
Language	English