01 Reversing-valve, indoor coil temperature, or refrigerant-cycle abnormality
02 Forced cooling or service-test operation indication
03 Indoor-outdoor communication or interface fault
04 Outdoor-unit fault; outdoor LED pattern may hold the sub-code
06 Float switch or drainage fault
07 Condensate evacuation pump manual start, drainage test mode, or central-board error
06 Abnormal water level detection
07 Drain pump test drive indication
08 Damper defective or air outlet damper self-diagnosis
09 Room temperature or indoor heat-exchanger thermistor fault
10 Indoor fan motor, fan lock, or fan-drive circuit fault
12 Indoor-outdoor connection, outdoor board connector, or communication power fault
13 EEPROM, microcomputer, or indoor control-board data fault
LD301-OFF No power supply
LD301-1 Reset stop
LD301-2 Peak current cut
LD301-3 Abnormal low speed rotation
LD301-4 Switching failure
LD301-5 Overload lower limit cut
LD301-6 Compressor temperature rise
LD301-7 Thermistor abnormal
LD301-9 Communication error
LD301-10 Power supply voltage error
LD301-11 Fan stop by strong wind
LD301-12 Fan lock stop
LD301-13 EEPROM reading error
LD301-14 DC voltage abnormal
LD301-15 Circuit abnormal
LD301-16 High load during stop
01 Indoor-unit float-switch protection activated
02 Outdoor-unit high-pressure protection activated
03 Abnormal communication between indoor and outdoor units
04 Abnormal communication between inverter PCB and outdoor PCB
05 Power-supply phase abnormality
06 Abnormal inverter voltage
07 Discharge-gas superheat decreased
08 Discharge-gas temperature increased
0A Abnormal communication between outdoor units
0b Incorrect sub-outdoor-unit address setting
0C Incorrect outdoor main-unit setting
11 Indoor inlet-air thermistor abnormality
12 Indoor outlet-air thermistor abnormality
13 Indoor freeze-protection thermistor abnormality
14 Indoor gas-pipe thermistor abnormality
15 EconoFresh outdoor-air thermistor abnormality
16 DOAS remote-sensor abnormality
17 DOAS wired-controller built-in thermistor abnormality
18 Indoor fan-system abnormality
19 Indoor-fan protection device activated
1A Indoor fan-controller fin-temperature abnormality
1b Indoor fan-controller overcurrent protection activated
1C Indoor fan-controller current-sensor problem
1d Indoor fan-controller protection activated
1E Indoor fan-controller voltage abnormality
21 High-pressure sensor abnormality
22 Outdoor-air thermistor abnormality
23 Compressor-top discharge-gas thermistor abnormality
24 Outdoor heat-exchanger liquid-pipe thermistor abnormality
25 Outdoor heat-exchanger gas-pipe thermistor abnormality
29 Low-pressure sensor abnormality
30 Incorrect outdoor-unit DSW settings for CH-Box
31 Incorrect outdoor-unit and indoor-unit capacity setting
35 Duplicate indoor-unit number in the refrigerant cycle
36 Incorrect indoor-unit combination
38 Outdoor protection-detection circuit abnormality
3A Outdoor-unit capacity abnormality
3b Incorrect outdoor-unit model combination or voltage setting
3d Abnormal communication between main and sub outdoor units
3E Incompatible inverter-PCB and outdoor-PCB combination
43 Pressure-ratio decrease protection activated
44 Low-pressure increase protection activated
45 High-pressure increase protection activated
47 Low-pressure decrease protection activated
48 Inverter overcurrent protection activated
51 Inverter current-sensor abnormality
53 Inverter error signal detected
54 Inverter fin-temperature abnormality
55 Inverter failure
57 Fan-controller protection activated
5A Fan-controller fin-temperature abnormality
5b Fan-controller overcurrent protection activated
5C Fan-controller sensor abnormality
A1 External abnormality input detected
b0 Incorrect indoor-unit model-code setting
b1 Incorrect unit or refrigerant-cycle number
b2 Indoor-unit EEPROM abnormality
b5 Incorrect indoor-unit count setting
b6 Indoor-PCB and indoor fan-controller communication abnormality
C1 Incorrect CH-Box connection
C2 Too many indoor units connected to the CH-Box
C3 Incorrect indoor-unit refrigerant number at the CH-Box
C4 Incompatible outdoor-unit connection to the CH-Box
C5 Incorrect CH-Box port setting
EE Compressor-protection alarm; cannot be reset from the wired controller
03 Abnormal transmission between a single-branch CH-Box and the outdoor unit
03 Abnormal transmission between a single-branch CH-Box and an indoor unit
60 Communication failure between Central Station EX and the outdoor unit while at least one indoor unit is on
61 Communication failure between an indoor unit and Central Station EX while the indoor unit is on
63 Inconsistent combination of central stations
64 Communication failure between Central Station EX and the outdoor unit while no indoor units are on
65 Communication failure between an indoor unit and Central Station EX while the indoor unit is off
FF Alarm reported by connected facility equipment
S10 Communication failure with PIO1
S11 Communication failure with PIO2
S20 Controller internal-memory capacity is insufficient
S21 Controller media write failure
S22 Controller media load failure
S23 Central Station EX adapter communication failure
S24 Daylight-saving-time update failure
S41 Calculation-file access failure
S42 Invalid controller download data
S43 Controller setting-data read or write failure