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Abnormal point and detecting method
Causes
Check points
1102
1300
1302
1500
High discharging temperature
Abnormal if discharge temperature thermistor
(TH4) exceeds 125: or 110: continuously
for 5 minutes.
Abnormal if pressure detected by high pressure
sensor and converted to saturation temperature
exceeds 40: during defrosting and discharge
temperature thermistor (TH4) exceeds 110:.
Low pressure (63L worked)
Abnormal if 63L is worked (under- 0.03MPa)
during compressor operation.
63L: Low-pressure switch
(1) High pressure (High-pressure switch
63H worked)
Abnormal if high-pressure switch 63H is
worked
( w ) during compressor operation.
w 4.15 MPa
63H: High-pressure switch
(2) High pressure
(High - pressure sensor 63HS detect)
Abnormal if high-pressure sensor detects
4.31MPa or more (or over 4.15MPa for
3 minutes) during the compressor operation.
Too low superheat due to low discharge
temperature
Abnormal if discharge super heat is
continuously detected less than or equal to
-15:
even though linear expansion valve has
minimum open pulse after compressor starts
operating for 10 minutes.
1 Over-heated compressor operation is
caused by shortage of refrigerant
2 Defective operation of stop valve
3 Defective thermistor
4 Defective outdoor controller board
5 Defective action of linear expansion
valve
1 Stop valve of outdoor unit is closed
during operation.
2 Disconnection or loose connection of
connector (63L) on outdoor controller
board
3
Disconnection or loose connection of 63L
4 Defective outdoor controller board
5 Leakage or shortage of refrigerant
6 Malfunction of linear expansion valve
1 Short cycle of indoor unit
2 Clogged filter of indoor unit
3 Decreased airflow caused by dirt of
indoor fan
4 Dirt of indoor heat exchanger
5 Locked indoor fan motor
6 Malfunction of indoor fan motor
7 Defective operation of stop valve
(Not full open)
8 Clogged or broken pipe
9 Locked outdoor fan motor
0 Malfunction of outdoor fan motor
1 Short cycle of outdoor unit
2 Dirt of outdoor heat exchanger
3 Decreased airflow caused by defective
inspection of outside temperature
thermistor (It detects lower temperature
than actual temperature.)
4 Disconnection or contact failure of
connector (63H) on outdoor controller
board
5 Disconnection or contact failure of 63H
connection
6 Defective outdoor controller board
7 Defective action of linear expansion
valve
8 Malfunction of fan driving circuit
9 Solenoid valve (SV1) performance
failure (High-pressure cannot be
controlled by SV1)
)
High-pressure sensor defective
! High-pressure sensor input circuit
defective in multi controller board.
1 Disconnection or loose connection of
discharge temperature thermistor. (TH4)
2
Defective holder of discharge temperature
thermistor.
1 Check intake super heat.
Check leakage of refrigerant.
Charge additional refrigerant.
2 Check if stop valve is full open.
34 Turn off and check if 5101 is
displayed when the power is put
again. When 5101 is displayed, refer
to “Check points” for 5101.
5 Check linear expansion valve.
1 Check stop valve.
2~4
Check the connector (63L) on outdoor
controller board.
5 Correct to proper amount of refrigerant.
6 Check linear expansion valve.
1~6 Check indoor unit and repair
defectives.
7 Check if stop valve is full open.
8 Check piping and repair defectives.
9~2 Check outdoor unit and repair
defectives.
3 Check the inspected temperature of
outside temperature thermistor on
LED display.
4~6
Check the connector (63H) on outdoor
controller board.
7 Check linear expansion valve.
8 Replace outdoor controller board.
9 Check the solenoid valve performance.
)
Check the high-pressure sensor.
!
Check the high-pressure sensor.
12 Check the installation conditions of
discharge temperature thermistor (TH4).
OC376B--2.qxp 08.1.17 1:15 PM Page 36