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11.4. Failure diagnosis
OUTDOOR UNIT TROUBLE SHOOTING
Error
code
Malfunction Description
Diagnosis and Analysis.
Remark
1
EEPROM malfunction
EEPROM chip damaged or data wrong or related circuit
damaged.
Non-resumable
2
PIM (power intelligent module)
hardware over current
Input over current occured been detected by PIM’s
hardware.
Resumable
3
Compressor over current during
deceleration
Over current occured during compressor deceleration
period.
Non-resumable
4
Communication abnormal
between control board and
compressor driver module
Control board can not communicating with compressor
driver module over 4 minutes
Resumable
5
Compressor overcurrent
detected by control board
Compressor over current been detected by control
board
Non-resumable
6
DC voltage or AC voltage high
AC power supply of the driver module get voltage over
280VAC or driver module get high DC-BUS voltage over
390VDC.
Resumable
7
Compressor current sampling
circuit fault
The driver module’s Compressor current sampling
circuit damaged.
Non-resumable
8
Discharge temperature too high
protection
Compressor discharge temperature over 115°C, error
clear within 3 minutes if temperature goes down and
lower than 115°C. Error status lock if it occurs 3 times
in 1 hour.
Non-resumable
9
DC fan motor fault
DC fan motor damage or not connected or related circuit
broken. Error status confirm and lock if occurs
times within 30 minutes.
Non-resumable
10
Outdoor defrosting temp, sensor
Te abnormal
Sensor temperature been detected below -55°C or
higher than 90°C or been detected as short circuit or
open circuit..
Resumable
11
Suction temp.sensor Ts
abnormal
12
Outdoor ambient temp, sensor
Ta abnormal
Sensor temperature been detected below -40°C or
higher than 90°C or been detected short circuit or open
circuit.
Resumable
13
Discharging temp, sensor Td
abnormal
Sensor temperature been detected below -40°C or
higher than 150°C or been detected short circuit or open
circuit.
Resumable
14
PFC circuit loop high voltage
Overvoltage been detected in driver module’s power
factor correction circuit loop.
Resumable
15
Communication abnormal
between indoor unit and outdoor
unit
Outdoor unit control board can not communicating with
intdoor unit control board over 4 minutes.
Resumable
16
Lack of refrigerant or discharging
pipe blocked
Discharge & suction temperatureTd-Ts≥80°C after
compressor started 10 minutes.Error status lock if it
occurs 3 times in 1 hour.
Non-resumable
17
4-way vavle converse abnormal
Indoor pipe & indoor ambient temperature
Tm-Tai≥5°C after compress- or started 10 minutes.
Error status lock if it occurs 3 times in 1 hour.
Non-resumable
18
Compressor motor
desynchronizing
Rotor desynchronizing occured, caused by overload or
load sharply fluctuating or compressor current sensor
cicuit abnormal or one of the inverter’s gate drive signal
missing.
Non-resumable
