61
Blinking
LED
Diagnosis of malfunction
Cause Check point
Reversed phase Phases L
1
, L
2
, and L
3
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.
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
● 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.
LD5 Thermal relay (51C) function
● 51C was connected incor-
rectly.
● 51C was working.
● Check 51C, the compressor, and power supply.
LD6 Thermal switch (26C) function.
● 26C was connected incor-
rectly.
● 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 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 connectors and transformers.
4) Check the fuse.
4. TROUBLESHOOTING ACCORDING TO CHECK CODE
5. WHEN OUTDOOR UNIT DOES NOT WORK
3-3 Total time of compressor operation
Compressor operation time is indicated in every accumulated-256-hour. To obtain the compressor operation time, add the
hours of lighting LEDs. During the compressor operation time indication, SW2 is not available.
3-4 Check code indication
● When a protection function works for the first time during operation, the operation stops and restarts after the 3-minutes
time delay mode. When the protection function works again, the operation stops. (Check mode) When both SW3-1 and
SW3-2 are OFF, the check code is indicated.
● If the outdoor controller board receives the compressor ON command from the indoor controller board during check
mode the indication changes to output state indication.
● By pressing SW2 during normal operation, operation will continue.
● The latest check code is indicated.
LD1
OC211-A--3.qxp 04.9.28 4:42 PM Page 61
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