FC Filter-clean reminder
E2 Anti-freezing protection
E3 Block or low pressure of refrigerant system
E4 Compressor exhaust high temperature protection
E5 AC over-current protection
E6 Communication failure between indoor unit and outdoor unit
E8 Anti-high temperature protection
H4 Anti-high temperature protection
H6 No feedback of indoor fan motor
C5 Jumper cap malfunction protection
LP Indoor unit and outdoor unit do not match
L3 Outdoor DC fan motor malfunction
L9 Power protection
Fo Gathering refrigerant
F1 Indoor ambient sensor open or short circuit
F2 Indoor tube sensor open or short circuit
F3 Outdoor ambient sensor open or short circuit
F4 Outdoor tube sensor open or short circuit
F5 Exhaust sensor open or short circuit
F6 Overload limit or drop frequency
F8 Over current limit or drop frequency
F9 High exhaust temperature limit or drop frequency
F0 Refrigerant leakage protection
FH Anti-freezing limit or drop frequency
H1 Defrosting
H3 Compressor overload protection
H5 IPM protection
H5 Module temperature is too high
HC PFC protection
EE Loading EEPROM malfunction
PH High PN voltage protection
PL Low PN voltage protection
U7 4-way valve reversal abnormal
d1 DRED demand-response mode
EU Frequency limiting by module temperature
LU Frequency limiting by power
01 Indoor-unit float-switch protection has activated
02 Outdoor-unit high-pressure protection has activated
03 Abnormal communication between indoor and outdoor units
04 Abnormal communication between inverter PCB and outdoor PCB
06 Abnormal inverter voltage Result 1 of 2 with this code and meaning. Expand for model and series details.
07 Discharge-gas superheat has decreased
08 Discharge-gas temperature has increased
11 Indoor-unit inlet-air thermistor abnormality
12 Indoor-unit outlet-air thermistor abnormality
13 Indoor-unit freeze-protection thermistor abnormality
14 Indoor-unit gas-pipe thermistor abnormality
15 ECONO outdoor-air thermistor abnormality
19 Indoor fan-motor protection has activated
20 Compressor-top discharge-gas thermistor abnormality
21 High-pressure sensor abnormality
22 Outdoor-air thermistor abnormality
24 Outdoor heat-exchanger piping thermistor abnormality
29 Low-pressure sensor abnormality
31 Outdoor-unit or indoor-unit capacity setting is incorrect
35 Indoor-unit number setting is duplicated
38 Outdoor-unit protection pick-up circuit problem
43 Pressure-ratio decrease protection has activated
44 Low-pressure increase protection has activated
45 High-pressure increase protection has activated
47 Low-pressure decrease protection has activated
48 Inverter overcurrent protection has activated
51 Inverter current-sensor abnormality
53 Inverter error signal detected
54 Inverter fin temperature abnormality
55 Inverter failure Result 1 of 2 with this code and meaning. Expand for model and series details.
57 Outdoor fan-motor abnormality
5b Fan-controller overcurrent protection has activated
5C Fan-controller current-sensor problem
b1 Unit or refrigerant-system number setting is incorrect
b5 Indoor-unit connection-number setting is incorrect
EE Compressor protection alarm Result 1 of 2 with this code and meaning. Expand for model and series details.
01 Activation of protection device (float switch)
02 Activation of protection device (high-pressure cut)
03 Abnormal communication between indoor and water-source units
04 Abnormal communication between inverter PCB and water-source-unit PCB
05 Abnormality of power-supply phases
06 Abnormal inverter voltage Result 2 of 2 with this code and meaning. Expand for model and series details.
07 Decrease in discharge-gas superheat
08 Increase in discharge-gas temperature
0A Abnormal communication between water-source units
0b Incorrect water-source-unit address setting
0C Incorrect water-source-unit main-unit setting
0d Water-temperature abnormality
11 Abnormality of inlet-air thermistor
12 Abnormality of outlet-air thermistor
13 Abnormality of freeze-protection thermistor
14 Abnormality of gas-piping thermistor
15 Abnormality of outdoor-air thermistor (EconoFresh)
16 Abnormality of remote sensor (DOAS)
17 Abnormality of thermistor built into remote controller (DOAS)
18 Abnormality of indoor fan system
19 Activation of protection device for indoor fan
1A Abnormality of fan-controller fin temperature
1b Activation of overcurrent protection
1C Problem with current sensor
1d Activation of fan-controller protection
1E Abnormality of indoor fan-controller voltage
21 Abnormality of high-pressure sensor
23 Abnormality of discharge-gas thermistor on top of compressor
24 Abnormality of heat-exchanger liquid-pipe thermistor
25 Abnormality of heat-exchanger gas-pipe thermistor
29 Abnormality of low-pressure sensor
2A Abnormality of entering-water thermistor
2b Abnormality of electrical-box thermistor
30 Incorrect connection of change-over box
31 Incorrect capacity setting of water-source and indoor units
35 Incorrect setting of indoor-unit number
36 Incorrect indoor-unit combination (R22 indoor unit)
38 Abnormality of protection pickup circuit in water-source unit
3A Abnormality of water-source-unit capacity
3b Incorrect water-source model combination or voltage
3d Abnormal communication between main and sub units
3E Abnormal combination between inverter PCB and water-source-unit PCB
43 Activation of pressure-ratio decrease protection
44 Activation of low-pressure increase protection
45 Activation of high-pressure increase protection
47 Activation of low-pressure decrease protection
48 Activation of inverter overcurrent protection
51 Abnormal inverter current sensor
53 Inverter error-signal detection
54 Abnormal inverter temperature
55 Inverter failure Result 2 of 2 with this code and meaning. Expand for model and series details.
A1 Detection of external abnormality
A2 Flow-switch abnormality
b0 Incorrect setting of unit model code
b1 Incorrect setting of unit and refrigerant-cycle number
b2 EEPROM abnormality
b5 Incorrect indoor-unit number setting
b6 Abnormal communication between indoor PCB and indoor fan controller
C1 Incorrect change-over-box connection
C2 Incorrect indoor-unit connection number
C3 Incorrect indoor-unit refrigerant-number setting
C5 Incorrect connection-port setting
E4 Water-source-unit cooling-fan abnormality
EE Compressor protection alarm Result 2 of 2 with this code and meaning. Expand for model and series details.