Troubleshooting - Lennox 3PC036 Installation Instruction

Troubleshooting

Table 9. Indoor Unit Error and Status
Code Display
Display Type Information
Status Defrost
dF
Filter cleaning reminder(power on display for
Status
CL
15 seconds).
Status Active clean
CL
Filter replacement reminder(power on display
Status
F
for 15 seconds).
Status Heating in room temperature under 8°C.
FP
Status Forced cooling.
FC
Status Remote switched off.
CP
The outdoor fan speed is operating outside of
Error
EC 07
the normal range.
Error Outdoor unit EEPROM parameter error.
EC 51
Condenser coil temperature sensor T3 is in
Error
EC 52
open circuit or has short circuited.
Outdoor ambient temperature sensor T4 is in
Error
EC 53
open circuit or has short circuited.
Compressor discharge temperature sensor
Error
EC 54
TP is in open circuit or has short circuited.
Evaporator coil outlet temperature sensor
Error (T2B multi-zone) is in open circuit or has
EC 56
short circuited (for free-match indoor units).
EH 00
Error Indoor unit EEPROM parameter error.
EH 0A
The indoor fan speed is operating outside of
Error
EH 03
the normal range.
Communication error between main control
Error
EH 0
6
board and display board.
Indoor room temperature sensor T1 is in open
Error
EH 60
circuit or has short circuited.
Evaporator coil middle temperature sensor T2
Error
EH 61
is in open circuit or has short circuited.
Error Refrigerant leakage detection.
EL 0C
Error Inverter module IPM error.
PC 00
Error High or Low voltage protection.
PC 01
Error High temperature sensed at compressor top.
PC 02
Error Low or High pressure protection.
PC 03
Error Inverter compressor drive error.
PC 04
Error Current overload protection.
PC 08
Table 9. Indoor Unit Error and Status
Display Type
Error
PC 0L
Error
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Table 10. 3PC Single Zone Outdoor Unit Error
Display Malfunction and Protection Indication
Communication malfunction between indoor and
EL01
outdoor units.
Capability mismatch between indoor unit and outdoor
FL14
unit
EC50 Outdoor temperature sensor error.
EC51
Outdoor EEPROM error.
EC52
Condenser coil temperature sensor (T3) malfunction.
EC53 Outdoor ambient temperature sensor (T4 ) malfunction.
Compressor discharge temperature sensor TP is in
EC54
open circuit or has short circuited
EC55 Outdoor IPM module temperature sensor malfunction
EC56 Outdoor T2B sensor error.
EC57 Refrigerant pipe temperature sensor error.
Outdoor DC fan motor malfunction/fan speed out of
EC07
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.
19
Code Display
Information
Outdoor low ambient temperature protection.
Indoor units mode conflict (match with multi
outdoor unit).
Codes