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Check Code Abnormal points and detection method
PFC error (Overvoltage/
Detailed
Undervoltage/Overcurrent)
codes
PFC detected any of the following:
a) Increase of DC bus voltage
to 430 V. (ZM60-140V)
b) Decrease in PFC control
voltage to 12 V DC or lower.
c) Increase in input current
10
to 50 A peak. (For models
equipped with single-phase
U9
PFC only) (ZM60-140V)
(4220)
PFC/IGBT error
(Undervoltage)
When Compressor is running,
20
DC bus voltage stays at 310V or
lower for consecutive 10 seconds
(ZM60–140V)
Over heat protection
Abnormal if outdoor pipe thermistor (TH3)
detects 70°C or more during compressor
operation.
Ud
(UD)*
(1504)
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)
Current sensor error or input current error
Abnormal of 38 A of input current is
detected, or 34 A or more of input current is
UH
detected for 10 seconds continuously
(5300)
OCH771
Cause
1 Abnormal increase in power source
voltage
2 Decrease in power source voltage,
instantaneous stop
3 Disconnection of compressor wiring
4 Misconnection of reactor
5 Defective outdoor power circuit board
6 Defective reactor
7 Disconnection or loose connection
of CN2 on the outdoor power circuit
board/controller circuit board
1 Incorrect switch settings on the
outdoor controller circuit board for
model select
2 Defective outdoor power circuit board
3 Defective outdoor controller circuit
board
1 Defective outdoor fan (fan motor)
or short cycle of outdoor unit during
cooling operation
2 Defective outdoor pipe thermistor
(TH3)
3 Defective outdoor controller board
1 Stop valve is closed.
2 Decrease of power supply voltage
3 Looseness, disconnection or reverse
of compressor wiring connection
4 Defective compressor
5 Defective outdoor power board
6 DIP switch setting difference of out-
door controller circuit board.
1 Disconnection of compressor wiring
2 Defective circuit of current sensor on
outdoor power circuit board
3 Decrease of power supply voltage
44
Judgment and action
12 Check the field facility for the power
supply.
3 Correct the wiring (U.V.W phase) to
compressor. Refer to "10-8. TEST
POINT DIAGRAM". (Outdoor power cir-
cuit board).
4 Correct the wiring of reactor.
5 Replace outdoor power circuit board.
6 Replace reactor.
7 Check CN2 wiring.
1 Correction of a model select
2 Replace outdoor power circuit board.
3 Replace outdoor controller circuit board
1 Check outdoor unit air passage.
23 Turn the power off and on again to
check the check code. If U4 is dis-
played, follow the U4 processing direc-
tion.
*The check code in the parenthesis indi-
cates PAR-4xMAA ("x" represents 0 or
later).
1 Open stop valve.
2 Check facility of power supply.
3 Correct the wiring (U
V
W phase) to
•
•
compressor. Refer to "10-8. TEST
POINT DIAGRAM" (Outdoor power
circuit board).
4 Check compressor.
Refer to "10-5. HOW TO CHECK THE
PARTS".
5 Replace outdoor power circuit board.
6 Check the DIP switch setting of outdoor
controller circuit board. Refer to "Model
Select" in "1) Function of switches" in
"10-9. FUNCTION OF SWITCHES,
CONNECTORS AND JUMPERS".
1 Correct the wiring (U
V
W phase) to
•
•
compressor. Refer to "10-8. TEST
POINT DIAGRAM" (Outdoor power
circuit board).
2 Replace outdoor power circuit board.
3 Check the facility of power supply.
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