Mitsubishi Electric PUHZ-HRP100VHA, Руководство по обслуживанию

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37
Error Code
Abnormal point and detection method
Case
Judgment and action
U5
(4230)
Temperature of heatsink
Abnormal if heatsink thermistor(TH8)
detects temperature indicated below.
HRP71V
·········································84
:
HRP100V ·········································84
:
HRP100Y ·········································95
:
HRP125Y ·········································95
:
1
The outdoor fan motor is
locked.
2
Failure of outdoor fan motor
3
Air flow path is clogged.
4
Rise of ambient temperature
5
Defective thermistor
6
Defective input circuit of
outdoor power circuit board
7
Failure of outdoor fan drive
circuit
12
Check outdoor fan.
3
Check air flow path for cooling.
4
Check if there is something which causes
temperature rise around outdoor unit.
(Upper limit of ambient temperature is 46
:
.)
Turn off power, and on again to check if U5 is
displayed within 30 minutes.
If U4 is displayed instead of U5, follow the
action to be taken for U4.
5
Check resistance value of thermistor (TH8)
or temperature by microprocessor.
(Thermistor/TH8: Refer to 11-6.)
(SW2 on A-Control Service Tool: Refer to 11-10.)
6
Replace outdoor power circuit board.
7
Replace outdoor controller circuit board.
U4
(TH3:5105)
(TH6:5107)
(TH7:5106)
(TH8:5110)
(TH32:5105)
(TH33:5105)
Open/short of outdoor unit thermistors
(TH3, TH32, TH33, TH6, TH7, and TH8)
Abnormal if open or short is detected
during compressor operation.
Open detection of thermistors TH3, TH32,
TH33 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. (PAC-SK52ST)
(Refer to 11-10.)
W
HRP100, 125Y
Heatsink thermistor(TH8) is in the power
module.
1
Check connection of connector (TH3, TH32,
TH33, TH7/6) on the outdoor controller circuit
board.
Check connection of connector (CN3) on the
outdoor power circuit board.
Check breaking of the lead wire for thermistor
(TH3, TH32, TH33, TH6,TH7,TH8).
Refer to 11-9.
2
Check resistance value of thermistor (TH3,
TH32, TH33, TH6,TH7,TH8) or check
temperature by microprocessor.
(Thermistor/TH3,TH6,TH7,TH8:
Refer to 11-6.)
(SW2 on A-Control Service Tool: Refer to
11-10.)
3
Replace outdoor controller circuit board.
W
Emergency operation is available in case
of abnormalities of TH3, TH32, TH33, TH6
and TH7.
Refer to 11-8.
1
Disconnection or contact failure
of connectors
Outdoor controller circuit board:
TH3, TH32, TH33, TH7/6
Outdoor power circuit board:
CN3
2
Defective thermistor
3
Defective outdoor controller
circuit board
( )
U6
(4250)
Power module
Check abnormality by driving power module
in case overcurrent is detected.
(UF or UP error condition)
1
Outdoor stop valve is closed.
2
Decrease of power supply voltage
3
Looseness, disconnection or
converse of compressor wiring
connection
4
Defective compressor
5
Defective outdoor power circuit
board
1
Open stop valve.
2
Check facility of power supply.
3
Correct the wiring (U
•
V
•
W phase) to
compressor. Refer to 11-9 (Outdoor power
circuit board).
4
Check compressor referring to 11-6.
5
Replace outdoor power circuit board.
U7
(1520)
Too low superheat due to low discharge
temperature
Abnormal if discharge superheat is
continuously detected less than or equal
to -15
:
for 3 minutes even though linear
expansion valve has minimum open pulse
after compressor starts operating for 10
minutes.
1
Disconnection or loose
connection of discharge
temperature thermistor (TH4)
2
Defective holder of discharge
temperature thermistor
3
Disconnection or loose connection
of linear expansion valve’s coil
4
Disconnection or loose
connection of linear expansion
valve’s connector
5
Defective linear expansion valve
12
Check the installation conditions of
discharge temperature thermistor (TH4).
3
Check the coil of linear expansion valve.
Refer to 11-7.
4
Check the connection or contact of LEV-A and
LEV-B on outdoor controller circuit board.
5
Check linear expansion valve.
Refer to 11-6.
Thermistors
Open detection Short detection
Symbol Name
TH3,TH32,TH33 Thermistor <Outdoor pipe> - 40 °C or below 90 °C or above
TH6 Thermistor <Outdoor 2-phasepipe> - 40 °C or below 90 °C or above
TH7 Thermistor <Outdoor> - 40 °C or below 90 °C or above
TH8 Thermistor <Heatsink> HRP71,100VHA - 27 °C or below 102 °C or above
TH8
Internal thermistor
HRP100,125YHA(2)/HRP100,125YHA2R1
/HRP71,100VHA2(R1),HRP100VHA2R2
- 35 °C or below 170 °C or above
OCH425D