Service & Parts Manual (2019, 2020, 2021, 2022)

243 PB
TROUBLESHOOTING
Outdoor Fault Codes
Fault code Fault description Possible reasons for
abnormality
How to deal with Remarks
53 Expansion valve D
(liquid) pipe sensor
fault
"1.The wiring of
the sensor for the
expansion valve
D (liquid pipe) is
connected loosely;
2.The sensor of the
expansion valve D
(liquid pipe) fails;
3.The sampling circuit
fails."
"1. Reconnect the wiring
of the sensor for the
expansion valve D
(liquid pipe);
2. Replace the sensor
for the expansion valve
D (liquid pipe);
3. Replace the outdoor
control board."
THIS CODE IS ONLY
APPLICABLE TO THE
42K MULTIZONE
OUTDOOR UNIT.
74 Indoor EEPROM Data
2 fault
EE in MCU is fails,
the unit can run, but
the function user has
set is ineffective.
Replace EE data in
MCU.
THIS CODE IS ONLY
APPLICABLE TO
MODELS PRODUCED
IN THE YEAR 2021 OR
LATER. THIS CODE
CAN APPEAR IF THE
CIRCUIT BOARDS ARE
REPLACED ON OLDER
MODELS.
81 Indoor ambient
Temperature Sensor
Fault
"1. The cable of the
room temperature
sensor is connect
loosely;
2. The room
temperature sensor
fails;
3. The sampling circuit
is abnormal."
"1. Reconnect the
cable of the room
temperature sensor;
2. Replace the room
temperature sensor;
3. Replace the indoor
control board."
THIS CODE IS ONLY
APPLICABLE TO
MODELS PRODUCED
IN THE YEAR 2021 OR
LATER. THIS CODE
CAN APPEAR IF THE
CIRCUIT BOARDS ARE
REPLACED ON OLDER
MODELS.
83 Evaporator Middle
Temperature Sensor
Fault
"1.The cable of the coil
temperature sensor of
the evaporator fails;
2.The coil temperature
sensor of the
evaporator fails;
3.The sampling circuit is
abnormal."
"1. Reconnect the
cable of the coil
temperature sensor of
the evaporator;
2. Replace the coil
temperature sensor of
the evaporator;
3. Replace the indoor
control board."
THIS CODE IS ONLY
APPLICABLE TO
MODELS PRODUCED
IN THE YEAR 2021
OR LATER THIS CODE
CAN APPEAR IF THE
CIRCUIT BOARDS ARE
REPLACED ON OLDER
MODELS.
91 "The unit turn off due to
the IPM
board over heating
fault"
"1. The outdoor ambient
is too high;
2. The speed of the out
fan motor is too low if
the fan motor is AC fan
motor;
3.The outdoor unit has
been installed without
standard;
4.The supply power is
too low."
"1. Normally protection;
2. Check the fan
capacitor, and replace
the fan capacitor if it is
failure;
3. Reinstalled the
outdoor unit refer to
the installation user
manual;
4.Normally protection."
THIS CODE IS ONLY
APPLICABLE TO
MODELS PRODUCED UP
TO AND INCLUDING THE
YEAR 2020.
96 Lacking of refrigerant The refrigerant of the
unit is not enough.
Discharge the
refrigerant and charge
the refrigerant referring
to the rating label.
97 4-way valve
commutation failure
fault
"1.The connecting wiring
of the 4- way valve coil
is loose;
2.The 4-way valve coil
fails;
3.The 4-way valve fails;
4.The driver board of
the 4-way valve fails."
"1. Reconnect the wiring
of the 4-way valve;
2. Replace the 4-way
valve coil;
3. Replace the 4-way
valve; 4.Replace the
driver board of the
4-way valve."