13
Liquid pipe humidity sensor of heat
exchanger of indoor unit operates improperly
14
16
Gas pipe temperature sensor of heat
exchanger of indoor unit operates
improperly Ambient temperature sensor of
fresh air processor operates improperly
19
Protective device in fan motor for indoor
unit acts
Fan motor is blocked or overheats, or
motor protection circuit is open
21
High pressure sensor operates improperly
(outdoor unit)
Sensor is in short circuit or open circuit
Connection wire is improper
PCB fails
22
Ambient temperature sensor operates
improperly (outdoor unit)
23
Exhaust
air temperature
sensor operates
improperly (outdoor unit)
24
Liquid-side
temperature
in
heat exchanger
operates improperly (outdoor unit)
25
Gas-side temperature in heat exchanger
operates improperly (outdoor unit)
29
LP pressure sensor operates
improperly (outdoor unit)
11
Return air temperature sensor of indoor
unit operates improperly
Temperature sensor is in short circuit or
open circuit
Connection wire is improper
PCB fails
12
Outlet air temperature sensor of indoor unit
operates improperly
31
Capacity combination of indoor and outdoor
units is incorrect
Capacity matching/connection between indoor and
outdoor units is Incorrect, capacity DIP switch is set
incorrectly, system numbering in
Hi-NET
Ⅱ
system is
incorrect
35
System number of outdoor unit or
address number of indoor unit is
set incorrectly
Duplicate system number is allocated in outdoor
units in one
Hi-NET
Ⅱ
system
Duplicate address number is allocated in indoor units
in one system
38
Outdoor protective circuit is improper
Protective circuit of outdoor unit acts, or PCB is
connected incorrectly
3a
Capacity of outdoor unit is improper
Combined capacity of outdoor units is larger than 54HP
3b
Outdoor units are combined incorrectly
Master/slave combination or supply voltage setting of
outdoor unit is incorrect
3d
Communication between master and
slaves of outdoor unit is improper
Wire is connected improperly; connecting terminal gets
loose
43
Pressure ratio low protection acts
Poor compression (compressor/frequency converter fails;
power supply is improper)
44
LP pressure rise protection acts
Indoor unit overloads in cooling operation; outdoor
temperature is too high in heating operation; expansion
valve fails
45
High pressure rise protection acts
Overloaded operation, system pipeline is blocked,
airflow is in short circuit, Refrigerant is overloaded;
non-condensable gas is mixed in
47
LP pressure low protection acts
Refrigerant is under-loaded, pipeline is blocked,
or expansion valve fails
48
Frequency converter over-
current protection acts
Overload operation; compressor fails
160
