Hisense AUD-18UX4SGKL Service Manual page 72

7.TROUBLE SHOOTING
The unit turn off
due to the IPM
91
board
heating fault
the ratio of the
discharge
pressure
92
the suction
pressure is too
large
The quantity of
the indoor units
and the
93 quantity
indoor unit
inconsistent
fault
the address of
94 the outdoor unit
conflict
the refrigerant
95 of the unit is
excessive fault
the refrigerant
96 of the unit is not
enough fault
4-way
97 commutation
failure fault
fan motor is failure;
5. The outdoor fan has been
blocked.
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;
over
3.The outdoor
installed without standard;
4.The supply power is too low.
1.The filter of the expansion valve
is dirty;
2. The difference between the
indoor room temperature and the
outdoor ambient temperature is too
large;
than
3. The refrigerant of the unit is not
enough;
4.;The expansion is failure or the
capillary is failure
5. The
temperature is too low in heating
mode
1. The indoor unit does not power
set on for all units;
of 2. The set quantity of the unit is
is incorrect;
3.Add or remove some indoor units
The address of the outdoor unit is
the same with the other outdoor
unit
The refrigerant of the unit is
excessive
The refrigerant of the unit is not
enough
1.The wiring of the 4-way valve coil
connect loose;
valve 2.The 4-way valve coil is failure;
3.The 4-way valve is failure;
4.The drive board of the 4-way
valve is failure
unit has been
outdoor ambient
the outdoor fan can run normally.
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.
1. Replace the expansion valve;
2. Normally protection;
3.Check the welding point of the unit
to confirm whether it exist leakage
point, and then add some refrigerant;
4.Replace the expansion valve or the
capillary;
5. Please let the unit operates within
the allowable temperature range.
1. Put all the indoor units power on;
2. Reset the quantity of the indoor
units;
3. Reset the quantity of the indoor
units
Change the setting address of the
outdoor unit
Discharge the refrigerant and charge
the refrigerant refer to the rating
label
Discharge the refrigerant and charge
the refrigerant refer to the rating
label
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 drive board of the
4-way valve.