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Abnormal point and detecting method
High discharging temperature
1102
Abnormal if discharge temperature thermistor
(TH4) exceeds 125
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)
1300
Abnormal if 63L is worked (under- 0.03MPa)
during compressor operation.
63L: Low-pressure switch
(1) High pressure (High-pressure switch
1302
63H worked)
Abnormal if high-pressure switch 63H is
worked
(
) during compressor operation.
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.
1500
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.
Over-heated compressor operation is
caused by shortage of refrigerant
Defective operation of stop valve
or 110
continuously
Defective thermistor
Defective outdoor controller board
Defective action of linear expansion
valve
Stop valve of outdoor unit is closed
during operation.
Disconnection or loose connection of
connector (63L) on outdoor controller
board
Disconnection or loose connection of 63L
Defective outdoor controller board
Leakage or shortage of refrigerant
Malfunction of linear expansion valve
Short cycle of indoor unit
Clogged filter of indoor unit
Decreased airflow caused by dirt of
indoor fan
Dirt of indoor heat exchanger
Locked indoor fan motor
Malfunction of indoor fan motor
Defective operation of stop valve
(Not full open)
Clogged or broken pipe
Locked outdoor fan motor
Malfunction of outdoor fan motor
Short cycle of outdoor unit
Dirt of outdoor heat exchanger
Decreased airflow caused by defective
inspection of outside temperature
thermistor (It detects lower temperature
than actual temperature.)
Disconnection or contact failure of
connector (63H) on outdoor controller
board
Disconnection or contact failure of 63H
connection
Defective outdoor controller board
Defective action of linear expansion
valve
Malfunction of fan driving circuit
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.
Disconnection or loose connection of
discharge temperature thermistor. (TH4)
Defective holder of discharge temperature
thermistor.
Causes
~
~
~
36
Check points
Check intake super heat.
Check leakage of refrigerant.
Charge additional refrigerant.
Check if stop valve is full open.
Turn off and check if 5101 is
displayed when the power is put
again. When 5101 is displayed, refer
to "Check points" for 5101.
Check linear expansion valve.
Check stop valve.
Check the connector (63L) on outdoor
controller board.
Correct to proper amount of refrigerant.
Check linear expansion valve.
Check indoor unit and repair
defectives.
Check if stop valve is full open.
Check piping and repair defectives.
Check outdoor unit and repair
defectives.
Check the inspected temperature of
outside temperature thermistor on
LED display.
~
Check the connector (63H) on outdoor
controller board.
Check linear expansion valve.
Replace outdoor controller board.
Check the solenoid valve performance.
Check the high-pressure sensor.
Check the high-pressure sensor.
Check the installation conditions of
discharge temperature thermistor (TH4).
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