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Troubleshooting
9. Troubleshooting
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. 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 via remote controller
Enter display control: press light button successively for 4 times within 3s to display the corresponding malfunction code;
Exit display control: pressing light button successively for 4 times within 3s or after display is shown for 5min, the display will
terminate.
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;
Corresponding indicator lamp will be on for 0.3s and off for 0.3s
Indicator Display
Malfunction Name
Dual-8 Nixie
Tube
Operation
indicator
Cooling
indicator
Heating
indicator
Malfunction of jumper cap
C5
blink 15 times
No feedback from indoor unit's motor
H6
blink 11 times
Circuit malfunction of zero crossing detection
U8
blink 17 times
Indoor ambient temperature sensor is open/short-circuited
F1
blink
once
Indoor evaporator temperature sensor is open/short-circuited
F2
blink
twice
Liquid valve temperature sensor is open/short-circuited
b5
blink
19 times
Gas valve temperature sensor is open/short-circuited
b7
blink
22 times
module temperature sensor is open/short-circuited
P7
blink
18 times
Outdoor ambient temperature sensor is open/short-circuited
F3
blink
3 times
Outdoor condenser tube temperature sensor is open/short-circuited
F4
blink
4 times
Outdoor discharge temperature sensor is open/short-circuited
F5
blink
5 times
Communication malfunction between indoor and outdoor units
E6
blink 6 times
Malfunction of phase current circuit detection for compressor
U1
blink
12 times
Error Code List:
