Mitsubishi Electric Mr.SLIM PUHZ-HRP100VHA Service Manual page 38

Abnormal point and detection method
Error Code
Outdoor fan motor
Abnormal if rotational frequency of the fan
motor is not detected during DC fan motor
operation.
Fan motor rotational frequency is
U8
abnormal if;
(4400)
• 100 rpm or below detected continuously
for 15 seconds at 20: or more outside
air temperature.
• 50 rpm or below or 1500 rpm or more
detected continuously for 1 minute.
Overvoltage or voltage shortage and
synchronous signal to main circuit
Abnormal if any of followings are detected
during compressor operation;
• Decrease of DC bus voltage to 310V
(HRP71, 100V only)
• Instantaneous decrease of DC bus voltage
HRP71, 100V : 200V,
HRP100, 125Y : 350V
• Increase of DC bus voltage to
HRP71, 100V : 400V
HRP100, 125Y : 760V
• Decrease of input current of outdoor unit
U9
to 0.1A only if operation frequency is more
(4220)
than or equal to 40Hz or compressor
current is more than or equal to 6A.
* Check U9 error detail (SW2 all ON).
Refer to 11-10.
Overheat protection
Abnormal if outdoor pipe thermistor (TH3),
condensing temperature T
Ud
YHA2(R1)) detects 70: or more during
(1504)
compressor operation.
Abnormal pressure of pressure sensor
(63HS) (Only for HRP·HA2(R1,R2))
Abnormal if pressure sensor (63HS)
detects 0.1 MPa or less.
UE
Detection is inoperative for 3 minutes after
(1302)
compressor starting and 3 minutes after
and during defrosting.
Compressor overcurrent interruption
(When compressor locked)
Abnormal if overcurrent of DC bus or
compressor is detected within 30 seconds
after compressor starts operating.
UF
(4100)
OCH425D
1 Failure in the operation of the
DC fan motor
2 Failure in the outdoor circuit
controller board
1 Decrease of power supply
voltage
2 Disconnection of compressor
wiring
3 Defective noise filter circuit
board (HRP71, 100VHA)
4 Disconnection or loose
connection of CN52C (HRP71,
100V)
5 Defective ACT module (HRP71,
100VHA)
6 Defective ACT module drive
circuit of outdoor power circuit
board (HRP71, 100V)
7 Disconnection or loose
connection of CNAF
(HRP71, 100VHA)
8 Disconnection or loose
connection of CN5 on the
outdoor power circuit board
9 Defective 52C drive circuit of
outdoor power circuit board
(HRP100, 125Y)
0 Disconnection or loose
connection of CN2 on the
outdoor power circuit board
1 Defective outdoor converter
circuit board (HRP100, 125Y)
1 Defective outdoor fan (fan
motor) or short cycle of outdoor
unit during cooling operation
(only V/
63HS
2 Defective outdoor pipe
thermistor (TH3), condensing
temperature T
YHA2(R1,R2))
3 Defective outdoor controller board
1 Disconnection or contact
failure of connector (63HS) on
the outdoor controller circuit
board
2 Defective pressure sensor
3 Defective outdoor controller
circuit board
1 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 board
Case
1 Check or replace the DC fan motor.
2 Check the voltage of the outdoor circuit
controller board during operation.
3 Replace the outdoor circuit controller board.
(When the failure is still indicated even after
performing the action 1 above.)
1 Check the facility of power supply.
2 Correct the wiring (U
compressor. Refer to 11-9 (Outdoor power
circuit board).
3 Replace noise filter circuit board.
(HRP71, 100VHA)
4 Check CN52C wiring.
5 Replace ACT module. (HRP71, 100VHA)
6 Replace outdoor power circuit board.
(HRP71, 100V)
7 Check CNAF wiring. (HRP71, 100VHA)
8 Check CN5 wiring on the outdoor power
circuit board. Refer to 11-9.
9 Replace outdoor power circuit board.
(HRP100, 125Y)
0 Check CN2 wiring on the outdoor power
circuit board. Refer to 11-9.
1 Replace outdoor converter circuit board.
(HRP100, 125Y)
1 Check outdoor unit air passage.
23 Turn the power off and on again to check
the error code. If U4 is displayed, follow
(only V/
63HS
the U4 processing direction.
1 Check connection of connector (63HS) on
the outdoor controller circuit board.
Check breaking of the lead wire for
thermistor (63HS).
2 Check pressure by microprocessor.
(Prssure sensor/ 63HS)
(SW2: Refer to 11-10.)
3 Replace outdoor controller 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.
Refer to 11-6.
5 Replace outdoor power circuit board.
38
Judgment and action
V W phase) to
• •