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Installation and Maintenance
Service Manual
9. Maintenance
9.1 Malfunction Display of Indoor Unit
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 “malfunction display table”;
(2) Operation state: immediate display; refer to “malfunction display table”;
(3) Other malfunctions: it is displayed after the compressor stops for 200s; refer to “malfunction display table”.
Note: when the compressor is restarted, the malfunction display delay time (200s) is cleared.
(4) When the unit is under limit frequency or frequency drop state, the display can be controlled via remote controller.
3. Display control via remote 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.
4. Display under test state
Dual 8 nixie tube display: minimum cooling (heating)-P0; middle cooling (heating)-P3
Nominal cooling (heating) –P1; maximum cooling (heating) –P2;
Malfunction Name
Dual-8 Nixie Tube
Malfunction of jumper cap
C5
No feedback from indoor unit's motor
H6
Circuit malfunction of zero crossing detection
U8
Indoor ambient temperature sensor is open/short-circuited
F1
Indoor evaporator temperature sensor is open/short-circuited
F2
Module temperature sensor is open/short-circuited
P7
Outdoor ambient temperature sensor is open/short-circuited
F3
Outdoor condenser tube temperature sensor is open/short-circuited
F4
Outdoor discharge temperature sensor is open/short-circuited
F5
Communication malfunction between indoor and outdoor units
E6
Malfunction of phase current circuit detection for compressor
U1
Module temperature protection
P8
Charging malfunction of capacitor
PU
Overload protection of compressor
H3
Freon recovery mode
Fo
Failure start-up of compressor
LC
Discharge high-temperature protection of compressor
E4
Overload protection
E8
Overcurrent protection of the complete unit
E5
Overcurrent protection of phase current
P5
Desynchronizing of compressor
H7
Module current protection (IPM protection)
H5
Low voltage protection of DC bus bar
PL
High voltage protection of DC bus bar
PH
PFC protection
HC
Limit/decrease frequency due to current protection of the complete unit
F8
Limit/decrease frequency due to module current protection (phase current)
En
Limit/decrease frequency due to discharge
F9
Limit/decrease frequency due to freeze protection
FH
Limit/decrease frequency due to overload
F6
Limit/decrease frequency due to module temperature protection
EU
Cold air prevention protection
E9
Freeze protection
E2
Malfunction of ODU DC fan
L3
Note: Please refer to service manual for the troubleshooting procedure for outdoor unit.
●Error Code List
