ICP DLF4AH09J1A - Diagnosis for Overload and Discharge Malfunctions

SERVICE MANUAL R−410A Ductless Split System: DLF4(A/H), DLC4(A/H)
76 421 08 9204 00
(6) Diagnosis for overload and discharge malfunction (outdoor unit malfunction)
Outdoor unit malfunction indicator status
Malfunction D5 D6 D16 D30
Overload    
Discharge    
Detection:
 If the electronic expansion valve is connected cor-
rectly? Is the expansion valve damage?
 If the refrigerant leaked?
 If the overload protector is damage?
 If the discharge temp sensor is damage?
Malfunction diagnosis process:
Connect the wire
well according to
wiring diagram
Check if the expansion valve
is blocked
If the wiring terminal FA of electronic
expansion is well connected?
Remove
malfunction?
Remove
malfunction?
Check if the coil of electronic
expansion is installed on the
valve normally
After the unit
End
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<10000
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