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Table 9.2 Alarm Code
Code
Classification
Alarm Content
Main Reason
01
Indoor Unit
Indoor protection device action (float
switch)
Water level is too high, drain, or float switch is
abnormal.
02
The Outdoor Unit
Outdoor protection device action (high
pressure switch)
Piping clogging, excessive refrigerant, non-
condensable gas mixed
03
Communication
Communication between indoor and
outdoor units is abnormal
Wrong wiring, loose terminal, disconnected,
outdoor unit power off, outdoor fuse blown
04
Communication between the inverter
board and the outdoor PCB is abnormal
Terminals loose, wire disconnected, outdoor unit
powered off, outdoor unit fuse blows off.
04.
Communication between fan control board
and outdoor PCB is abnormal
Terminals loose, broken, fuse blown
05
Power Supply
Power phase anomaly
Power supply error, power phase error, power
wiring phase missing
06
Inverter voltage is abnormal
Outdoor unit voltage is too low, power capacity is
not enough
06.
Fan control voltage is abnormal
Outdoor unit voltage is too low, power capacity is
not enough
07
Circulatory
System
Exhaust superheat TdSH is too low
Excessive refrigerant, expansion valve lock, wiring,
piping connection error, thermistor fault, valve
room - outdoor unit, refrigerant, electrical system
connection error
08
Exhaust temperature Td (top of
compressor) is too high
Insufficient refrigerant, expansion valve lock, wiring,
piping connection error, thermistor fault, valve
room - outdoor unit, refrigerant, electrical system
connection error
0A
Communication
Communication abnormal between
outdoor units
Communication wire connection error, wire
disconnected, terminal loosening.
0b
The Outdoor Unit
The outdoor unit address is incorrect
The same system has two sets of the same set of
outdoor unit (slave machine)
0C
The main outdoor unit is set incorrectly
There are 2 or more master units in the same
system
11
Indoor Unit
Sensor
Return air thermistor abnormal
Indoor thermistor wiring is wrong, broken, not
connected or shorted.
12
Air supply thermistor error
13
Heat exchanger liquid pipe (anti-freeze)
thermistor abnormal (indoor unit)
14
Ambient Thermistor Abnormal (Indoor)
15
Ambient thermistor abnormality (indoor
unit)
16
Wired controller thermistor exception
(fresh air treatment)
17
Wired controller built-in thermistor
abnormal (fresh air treatment)
19
Fan Motor
Indoor fan protection device action
Indoor fan motor overheats or stuck
21
The Outdoor Unit
Sensor
High pressure sensor is abnormal
Outdoor thermistor wiring is wrong, broken, not
connected or shorted
22
Ambient thermistor abnormality (outdoor
unit)
23
Compressor top thermistor abnormality
(outdoor unit)
24
Outdoor exchanger liquid pipe Thermistor
Abnormal
Outdoor thermistor wiring is wrong, broken, not
connected or shorted.
25
Outdoor heat exchanger / sub cooler gas
side inlet / air side out of the thermistor
abnormalities
29
Low pressure sensor is abnormal