Mitsubishi Electric PUMY-P100VHM Technical & Service Manual page 34

Display Meaning and detecting method
Abnormal high discharging temperature
1102
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:.
Abnormal low pressure (63L worked)
1300
Abnormal if 63L is worked (under- 0.03MPa)
during compressor operation.
63L: Low-pressure switch
(1) Abnormal high pressure (High-pres-
1302
sure switch 63H worked)
Abnormal if high-pressure switch 63H is
worked
( w ) during compressor operation.
w 4.15 MPa
63H: High-pressure switch
(2) Abnormal 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
Abnormality of super heat 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.
Causes
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.
34
Check points
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).