Mitsubishi Electric Mr.SLIM PUHZ-RP6VHA, Техническое и сервисное руководство

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Error Code Meaning of error code and detection method
Judgment and action
U1
(1302)
Abnormal high pressure (High-pressure
switch 63H worked)
Abnormal if high-pressure switch 63H
worked (more than 4.41 MPa) during com-
pressor operation.
63H: High-pressure switch
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
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.
(A-Control Service Tool : Refer to P53-60.)
4
~
6
Put the power off and check F5 is dis-
played when the power is put again.
When F5 is displayed, refer to “Judgment
and action” for F5.
7
Check linear expansion valve.
Refer to P39.
8
Replace outdoor controller board.
Case
U2
(1102)
Abnormal high discharging temperature
Abnormal if discharge temperature ther-
mistor (TH4) exceeds 110
:
continuously
for 5 minutes.
Abnormal if condenser/evaporator temper-
ature thermistor (TH5) exceeds 40
:
during defrosting and discharge tempera-
ture thermistor (TH4) exceeds 110
:
.
1
Over-heated compressor oper-
ation 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
Check intake super heat.
Check leakage of refrigerant.
Charge additional refrigerant.
2
Check if stop valve is full open.
34
Put the power off and check if U3 is dis-
played when the power is put again.
When U3 is displayed, refer to “Judgement
and action” for U3.
5
Check linear expansion valve.
Refer to P39.
U3
(5104)
Open/short circuit of discharge temper-
ature thermistor (TH4)
Abnormal if open (3
:
or less) or short
(217
:
or more) is detected during com-
pressor operation.
(Detection is inoperative for 10 minutes of
compressor starting process and for 10
minutes after and during defrosting.)
1
Disconnection or contact fail-
ure of connector (TH4)
2
Defective thermistor
3
Defective outdoor controller
board
1
Check contact of connector or electric wire
of thermistor.
2
Check resistance value of thermistor, or
check temperature by microcomputer
(A-Control Service Tool : Refer to P53-60.)
Refer to P39.
3
Replace outdoor controller board.
U4
(TH3:5105)
(TH6:5107)
(TH7:5106)
(TH8:5110)
Open/short of outdoor unit thermistors
(TH3, TH6, TH7, and TH8)
Abnormal if open or short is detected
during compressor operation.
Open detection of thermistors TH3 and
TH6 is inoperative for 10 seconds to 10
minutes after compressor starting and 10
minutes after and during defrosting.
W
Check which unit has abnormality in its
thermistor by switching the mode of
SW2.
(Refer to page 58.)
1
Disconnection or contact fail-
ure of connectors
(TH3/TH6/TH7/TH8)
2
Defective thermistor
3
Defective outdoor controller
board
1
Check contact of connector or electric wire
of thermistor.
2
Check resistance value of thermistor, or
check temperature by microcomputer (Mode
(A-Control Service Tool : Refer to P53-60.)
Refer to P39.
3
Replace outdoor controller board.
W
Emergency operation is available in case of
abnormalities of TH3, TH6 and TH7. Refer to
P43.
Thermistors
Open detection Short detection
Symbol Name
TH3
TH6
TH7
TH8 – 40
:
or below
– 40
:
or below
– 40
:
or below
– 27
:
or below
90
:
or above
90
:
or above
90
:
or above
102
:
or above
Pipe temperature thermistor / Liquid
Condenser/evaporator temperature thermistor
Outside temperature thermistor
Heat sink temperature thermistor
<Abnormalities detected while unit is operating>
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