6
7
7
Blinking
LED
Diagnosis of malfunction
Cause
Check point
LD1
Reversed phase
Phases L
1
, L
2
, and L
are con-
nected improperly.
Check the power supply connection.
LD2
Open phase
● Phase L
2
is open.
● Contact of protector, such as
thermal switch, opened when
power was turned on.
● Check the power supply.
● Check each protector.
LD
Outdoor coil thermistor is
abnormal. (Open circuit or short
circuit)
● Outdoor coil thermistor is bro
-
ken.
● Thermistor was connected
incorrectly.
● Measure the resistance of the thermistor.
● Check the thermistor. If normal, replace the out
-
door controller board.
LD
High pressure switch (6H2)
function
● 62H2 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.
LD
Thermal relay (1C) function
●
1C was connected incorrectly.
● 51C was working.
● Check 51C, the compressor, and power supply.
LD6
Thermal switch (26C) function.
●
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 67°C.
● Measure the resistance of the thermistor.
● Check the outdoor fan motor.
● Check if air cycle is short-cycled.
LD8
Input circuit of outdoor controller
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.
) Connector or transformer is broken.
) Fuse (6.A) in the outdoor controller board is blown.
Check points
1) Check the connecting wires.
2) Check the power supply.
) Check connectors and transformers.
) Check the fuse.
4. TROUBLESHOOTING ACCORDING TO CHECK CODE
5. WHEN OUTDOOR UNIT DOES NOT WORK
OC229A
