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Installation and Maintenance
Service Manual
8. Maintenance
8.1 Error Code
1. Malfunction display requirement
When there are several malfunctions, they will be displayed circularly.
2. Malfunction display method
(1) Hardware malfunction: immediate display; refer to “error code list”;
(2) Operation state: immediate display; refer to “error code list”;
(3) Other malfunctions: it is displayed after the compressor stops for 200s; refer to “error code list”.
Note: when the compressor is restarted, the malfunction display delay time (200s) is cleared.
3. Malfunction display control
The indicator lamp and dual 8 nixie tube displays shall be synchronized. That is when the indicator lamp blinks, the dual 8 nixie
tube displays the corresponding malfunction code.
4. Display control viaremote controller
Enter display control: press light button successively for 6 times within 3s to display the corresponding malfunction code;
Exit display control: pressing light button successively for 6 times within 3s or after display is shown for 5min, the display will
terminate.
Error Code List
Malfunction Name Malfunction types
Dual-8
Nixie Tube
Indicator Display
Operation
indicator
Cooling
indicator
Heating
indicator
Fault in input power zero Hardware malfunction U8 blink 17 times
Jumper cap malfunction protection Hardware malfunction C5 blink 15 times
No feedback of indoor fan motor Hardware malfunction
H6 blink 11 times
Indoor ambient sensor open or short circuit Hardware malfunction F1 blink once
Indoor tube sensor open or short circuit Hardware malfunction F2 blink twice
Inlet tube sensor malfunction Hardware malfunction b5 blink 19 times
Outlet tube sensor malfunction Hardware malfunction b7 blink 22 times
IPM sensor circuit malfunction Hardware malfunction P7 blink 18 times
Outdoor ambient sensor open or short circuit Hardware malfunction F3 blink 3 times
Inlet pipe temperature sensor of outdoor
condenser is open-circuit/short circuit(commercial
air con)
Hardware malfunction A5
Outdoor tube sensor open or short circuit Hardware malfunction F4 blink 4 times
outlet pipe temperature sensor of outdoor
condenser is open-circuit/short circuit(commercial
air con)
Hardware malfunction A7
Exhaust sensor open or short circuit Hardware malfunction F5 blink 5 times
Communication failure between indoor unit and
outdoor unit
Hardware malfunction E6 blink 6 times
Compressor phase current detection circuit
malfunction
Hardware malfunction U1 blink 12 times
Compressor demagnetization protection It can be displayed
through remote
controller within 200s
and displayed directly
after 200s
HE blink 14 times
PN voltage drop protection U3 blink 20 times
IPM high temperature protection P8 blink 19 times
Refrigerant-lacking or blockage protection F0 blink 10 times
Capacitor charge malfunction Hardware malfunction PU blink 17 times
Refrigerant system high pressure protection Hardware malfunction E1 blink once
system low-pressure protection (reserved) Hardware malfunction E3 blink 3 times
Compressor over load protection
It can be displayed
through remote
controller within 200s
and displayed directly
after 200s
H3 blink 3 times
Fault in matching Hardware malfunction LP blink 19 times
Loading EEPROM malfunction Hardware malfunction EE blink 15 times
AC current detect circuit malfunction Hardware malfunction U5 blink 13 times
Outdoor DC fan motor malfunction Hardware malfunction L3 blink 23 times
Mode conict operation status E7 blink 7 times
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