Service manual

23
Blinking
LED
Diagnosis of malfunction Cause Check point
LD1
Reversed phase This model does not have this
function.
No need to be checked.
LD2
Open phase This model does not have this
function.
No need to be checked.
LD3
Outdoor coil thermistor is
abnormal. (Open circuit or short
circuit)
● Outdoor coil thermistor is
broken.
● Thermistor was connected
incorrectly.
● Measure the resistance of the thermistor.
● Check the thermistor. If normal, replace the out-
door controller board.
LD4
High pressure switch (63H2)
function
● 63H2 was badly connected.
● 63H2 was working.
● Check 63H2 and the outdoor fan motor.
● Check if refrigerant supply is low.
● Check if air cycle is short-cycled.
LD5
Thermal relay function
(PU42EK7)
● 51C is working. ● Check 51C.
LD6
Thermal switch (26C) function
(PU42EK7)
(PU42EK7
1)
● 26C was connected incorrectly.
● 26C is working.
● Check 26C.
● Check if refrigerant supply is low.
● Check if the capillary tube is clogged.
LD7
Over heat protection ● The thermistor is broken.
● Coil temperature is over
153˚F.
● Measure the resistance of the thermistor.
● Check the outdoor fan motor.
● Check if air cycle is short-cycled.
LD8
Input circuit of outdoor con-
troller board is abnormal.
● Pulse input is abnormal. ● Replace the outdoor controller board.
Cause
1) Indoor/outdoor connecting wires are poorly connected.
(Refer to next page.)
2) Power supply is poorly connected.
3) Connector or transformer is broken.
4) Fuse (6A) in the outdoor controller board is blown.
Check points
1) Check the connecting wires.
2) Check the power supply.
3) Check connector and transformers.
4) Check the fuse.
2. TROUBLESHOOTING ACCORDING TO CHECK CODE
3. WHEN OUTDOOR UNIT DOES NOT WORK
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