Service Manual
59
Installation and Maintenance
6. Diagnosis for Overload and Discharge Malfunction (Outdoor unit malfunction)
Outdoor unit malfunction indicator status
Main detection point:
●If the electron expansion valve is connected well? Is the expansion valve damaged?
●If the refrigerant is leakage?
●If the overload protector is damaged?
●If the discharge temp sensor is damaged?
Malfunction diagnosis process:
Malfunction
D5
D6
D16
D30
Overload
□
☆
☆
□
Discharge
■
□
■
☆
Connect the wire
well according to
wiring disgram
Check if the expansion valve
is blocked
If the wiring terminal FA of electron
expansion is well connected?
Remove
malfunction?
Remove
malfunction?
Check if the coil of electron
expansion is installed on the
valve normally
End
After the u nit
de-energized
for 20min
Y
N
N
N
If the overload protector SAT
is well connected?
N
Under ambient temperature, test the
resistance of overload protector with ohmic
meter, the resistance value<10000Ω
Y
Y
Replace overload
protector SAT
N
Y
Y
Check refrigerant, if there is leakage,
please refer to specification
Replace control
board
check if the discharge temp
sensor is normal according to the
resistance sheet
Y
N
Replace discharge
temp sensor
