Mitsubishi Electric PUZ-HA30NHA5, Руководство по обслуживанию

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<Abnormalities detected while unit is operating>
Check code Abnormal point and detection method
Judgment and action
U1
(1302)
High pressure (High-pressure switch
63H worked)
Abnormal if high-pressure switch 63H
worked (*) during compressor operation.
*602 PSIG [4.15 MPa]
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 defect.
7
Check if stop valve is fully open.
8
Check piping and repair defect.
9
–
2
Check outdoor unit and repair defect.
3
Check the detected temperature of outside
temperature thermistor on LED display.
(SW2 on A-Control Service Tool : Refer
to "10-10. FUNCTION OF SWITCHES,
CONNECTORS AND JUMPERS". )
4
–
6
Turn the power off and check F5 is
displayed when the power is on again.
When F5 is displayed, refer to “Judgment
and action” for F5.
7
Check linear expansion valve.
Refer to "10-6. HOW TO CHECK THE
PARTS".
8
Replace outdoor controller board.
Case
U2
(1102)
High discharge temperature
(1) Abnormal if discharge temperature
thermistor (TH4) exceeds 257˚F
[125
:
] or 230˚F [110
:
] continuously
for 5 minutes.
Abnormal if condenser/evaporator
temperature thermistor (TH5) exceeds
104˚F [40
:
] during defrosting and
discharge temperature thermistor (TH4)
exceeds 230˚F [110
:
].
(2) Abnormal if discharge superheat
(Cooling: TH4−TH5/Heating: TH4−TH6)
exceeds 126˚F [70
:
].
1
Overheated compressor opera-
tion 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
6
Clogging with foreign objects in
refrigerant circuit.
Note: logging occurs in the parts
which become below
freezing point when water
enters in the refrigerant
circuit.
1
Check intake superheat.
Check leakage of refrigerant.
Charge additional refrigerant.
2
Check if stop valve is fully open.
34
Turn the power off and check if U3 is dis-
played when the power is on again.
When U3 is displayed, refer to “Judgment
and action” for U3.
5
Check linear expansion valve.
Refer to "10-6. HOW TO CHECK THE
PARTS".
6
After recovering refrigerant, remove water
from entire refrigerant circuit under vacuum
more than 1 hour.
<Abnormalities detected while unit is operating>
U3
(5104)
Open/short circuit of discharge
temperature thermistor (TH4)
Abnormal if open (37˚F [3
:
] or less) or
short (422˚F [217
:
] or more) is detected
during compressor operation.
(Detection is inoperative for 10 minutes
of compressor starting process and for 10
minutes after and during defrosting.)
1
Disconnection or contact failure
of connector (TH4) on the out-
door controller circuit board
2
Defective thermistor
3
Defective outdoor controller cir-
cuit board
1
Check connection of connector (TH4) on the
outdoor controller circuit board.
Check breaking of the lead wire for ther-
mistor (TH4). Refer to "10-9. TEST POINT
DIAGRAM".
2
Check resistance value of thermistor
(TH4) or temperature by microcomputer.
(Thermistor/TH4: Refer to "10-6. HOW TO
CHECK THE PARTS".) (SW2 on A-Control
Service Tool: Refer to "10-10. FUNCTION
OF SWITCHES, CONNECTORS AND
JUMPERS".)
3
Replace outdoor controller board.
OCH607