17
Trouble shooting
FAILURE
CODE
STATE OF
LED 5-4-3-2-1
TROUBLE
SHOOTING
POSSIBLE REASONS
DC fan motor fault
Fan is blocked, or the terminal is disconnected
from the PCB
Faulty 4-way valve
switching on
Coil of 4-way valve is disconnected, or faulty
outdoor PCB
Abnormal communication
between main PCB and
SPDU(or ISPM)
Communication cables broken, or not be well
connected, or faulty main PCB, or faulty SPDU(or
ISPM)
Compressor be locked
Faulty compressor or SPDU(or ISPM)
Compressor vibration too big Faulty compressor
Compressor lose position
Faulty SPDU(or ISPM)
Faulty compressor start
Faulty compressor or SPDU(or ISPM)
Faulty position checking
circuit
Faulty SPDU(or ISPM)
Compressor broken
Faulty compressor or SPDU(or ISPM)
Take off the plastic cover on the right side of the unit, you can find the LEDs near the communication terminal.
Symbol means the LED is ON, and symbol means the LED is OFF.
15
16
25
26
27
28
29
30
31
1
Faulty defrost sensor
Te
Sensor disconnected, or broken, or short circuit
Faulty sensor
Tao
Sensor disconnected, or broken, or short circuit
2
Faulty sensor
Ts
Sensor disconnected, or broken, or short circuit
3
Faulty sensor
Td
Sensor disconnected, or broken, or short circuit
4
Input overcurrent
Over current of the system, or broken of the current
sensor,or malfunction with indoor or outdoor fan
motors, or faulty PCB.
5
Abnormal communication
between indoor and outdoor
units
Wrong connection, or the wires be disconnected, or
wrong address setting of indoor units, or faulty
PCB, or faulty power supply
6
System high pressure
protection
High pressure switch is disconnected, or high
pressure switch worked, or Tc too high and faulty
outdoor fan motor when cooling, or faulty indoor
fan motors when heating, or refrigerant
overabundance
9
System low pressure
protection
Low pressure switch is disconnected, or low
pressure switch worked, or Te too low and faulty
outdoor fan motors when heating, or faulty indoor
fan motor when cooling, or refrigerant shortage
10
IPM protection
IPM over current, or short circuit, or IPM
temperature too high, or IPM input voltage too
low,or faulty SPDU(or ISPM).
11
EEPROM fault
Faulty outdoor unit PCB
12
Over hot protection of
compressor
Serious lack of refrigerant of the system, or the
ambient temperature too high, or PMVs be
blocked
13
Over hot protection of SPDU
(or ISPM)
Ambient tempreatrue too high, or outdoor fan be
blocked, or bad air circulation of outdoor unit
14
Faulty sensor
Tc
Sensor disconnected, or broken, or short circuit
17
Faulty sensor
Toci
Sensor disconnected, or broken, or short circuit
21
Low voltage protection
VDC<194V, too low voltage from power source
23
24
High voltage protection
VDC>400V, too high voltage from power source
