Hisense 2AMW-42U4RRA, Technical & Service Manual, Page: 68 / 80

14.TROUBLESHOOTING
NOTE 1:
If the indoor unit can not turn on or the indoor unit turn off itself after 30s, at the same time the unit do
not display the fault code, please check the fire and the socket of the control board.
NOTE 2:
If the indoor unit display the 75,76,77,78 fault code after you turn on the unit, please check the
TEST seat of the indoor control board or the TEST detection circuit whether exists short circuit.
Note 3 :
Overload in cooling mode
Fault
Code
Fault Description Possible Reason of Abnormality How to Deal With Remarks
97
64
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.
Overload in cooling mode
sr. The root cause Corrective measure
1 The refrigerant is excessive.
Discharge the refrigerant, and recharge
the refrigerant referring to the rating label.
2 The outdoor ambient temperature is too high. Please use within allowable temperature range
3
Short-circuit occurs in the air outlet and air inlet of
the outdoor unit. Adjust the installation of the outdoor unit
referring to the user manual.
4
The outdoor heat exchanger is dirty, such
as condenser. Clean the heat exchanger of the outdoor unit,
such as condenser.
5 The speed of the outdoor fan motor is too low. Check the outdoor fan motor and fan capacitor.
6
The outdoor fan is broken or the outdoor fan
is blocked.
Check the outdoor fan.
7 The air inlet and outlet has been blocked. Remove the blocked objects.
8 The expansion valve or the capillary fails. Replace the expansion valve or the capillary.
NOTE 4 : Over load in heating mode
Overload in heating mode
sr. The root cause Corrective measure
1 The refrigerant is excessive.
Discharge the refrigerant, and recharge
the refrigerant referring to the rating label.
2 The indoor ambient temperature is too high. Please use within allowable temperature range.
3
Short-circuit occurs in the air outlet and air
inlet of the indoor unit. Adjust the installation of the indoor unit referring
to the user manual.
4 The indoor filter is dirty. Clean the indoor filter.
5 The speed of the indoor fan motor is too low. Check the indoor fan motor and fan capacitor.
6
The indoor fan is broken or the outdoor fan
is blocked.
Check the indoor fan.
7 The air inlet and outlet has been blocked. Remove the blocked objects.
8 The expansion valve or the capillary fails. Replace the expansion valve or the capillary.