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Technical Information
9. TROUBLESHOOTING
9.1 FLASHING LED OF INDOOR/OUTDOOR UNIT AND PRIMARY
JUDGEMENT
1. Requirement of malfunction display.
When several malfunctions happen at the same time, malfunction codes will be displayed circularly.
2. Malfunction display method
• Hardware malfunction: it will be displayed immediately, please refer to “Malfunction status sheet”;
• Operation status: it will be displayed immediately, please refer to “Malfunction status sheet”;
• Other malfunction: It will be displayedafter the compressor has been stopped for 200s, please refer to “Malfunction
status sheet”.
3. Malfunction display control
Indoor unit displays malfunction code as shown in the sheet below. ODU communication lightwillbeoff for 1s and then
blink for 1s circularly.
4. Viewing malfunction code through remote controller
Enter viewing malfunction code: pressing light button for 6 times within 3S to view malfunction code;
Exit viewing malfunction code: pressing light button for 6 times within 3S or after the malfunction code is displayed for
5min.
Malfunction status sheet
Malfunction name
Malfunction type
Nixie tube
Zero cross detection circuit malfunction(for indoor unit)
Hardware malfunction
U8
Malfunction protection of jumper cap(for indoor unit)
Hardware malfunction
C5
Feedback of without IDU motor(for indoor unit)
Hardware malfunction
H6
Indoor ambient temperature sensor is open/short circuited
Hardware malfunction
F1
Indoor evaporator temperature sensor is open/short circuited
Hardware malfunction
F2
Liquid valve temperature sensor is open/short circuited
Hardware malfunction
b5
Gas valve temperature sensor is open/short circuited
Hardware malfunction
b7
Modular temperature sensor is open/short circuited
Hardware malfunction
7P
Outdoor ambient temperature sensor is open/short circuited
Hardware malfunction
F3
Outdoor condenser middle pipe temperature sensor is open/short
circuited
Hardware malfunction
F4
Outdoor discharge temperature sensor is open/short circuited
Hardware malfunction
F5
Communication malfunction
Hardware malfunction
E6
Malfunction of phase current detection circuit for compressor
Hardware malfunction
U1
Module high temperature protection
Hardware malfunction
P8
Refrigerant lacking or blockage protection of system (not available
for residential ODU)
Viewing malfunction code
through remote controller within
200s; displayed directly on
nixietube after 200s
F0
Charging malfunction of capacitor
Hardware malfunction
PU
High pressure protection of system
Hardware malfunction
E1
Low pressure protection of system (reserved)
Hardware malfunction
E3
