Mitsubishi Electric PUZ-SWM60VAA Service Manual page 30

Check code Abnormal point and detection method
Compressor overcurrent interruption
Abnormal if overcurrent DC bus or
compressor is detected after compressor
starts operating for 30 seconds.
UP
(4210)
Remote controller transmission error
(E0)/signal receiving error (E4)
Abnormal if main remote controller
cannot receive normally any
transmission from indoor unit of
refrigerant address "0" for 3 minutes.
(Check code: E0)
Abnormal if indoor controller board can-
not receive normally any data from
E0
remote controller board or from other
or
indoor controller board for 3 minutes.
E4
(Check code: E4)
(6831
Indoor controller board cannot receive
or
any signal from remote controller for 2
6834)
minutes. (Check code: E4)
Remote controller control board
Abnormal if data cannot be normally
E1
read from the nonvolatile memory of the
or
remote controller control board.
E2
(Check code: E1)
(6201
Abnormal if the clock function of remote
or
controller cannot be normally operated.
6202)
(Check code: E2)
Remote controller transmission error
(E3)/signal receiving error (E5)
Abnormal if remote controller could not
find blank of transmission path for 6
seconds and could not transmit.
(Check code: E3)
Remote controller receives transmitted
E3
data at the same time, compares the
or data, and when detecting it, judges
different data to be abnormal 30
E5
continuous times. (Check code: E3)
(6832
or
Abnormal if indoor controller board could
6833)
not find blank of transmission path.
(Check code: E5)
Indoor controller board receives
transmitted data at the same time,
compares the data, and when detecting
it, judges different data to be abnormal
30 continuous times. (Check code: E5)
OCH809A
Cause
Stop valve of outdoor unit is closed.
Decrease of power supply voltage
Looseness, disconnection or
converse of compressor wiring
connection
Defective fan of indoor/outdoor units
Short cycle of indoor/outdoor units
Defective input circuit of
outdoor controller board
Defective compressor
Defective outdoor power circuit board
DIP switch setting difference of
outdoor controller circuit board
Contact failure at transmission
wire of remote controller
Miswiring of remote controller
Defective transmitting receiving
circuit of remote controller
Defective transmitting receiving
circuit of indoor controller board
of refrigerant address "0"
Noise has entered into the
transmission wire of remote
controller.
Defective remote controller
Duplication of refrigerant
address
Defective transmitting receiving
circuit of remote controller
Defective transmitting receiving
circuit of indoor controller board
Noise has entered into
transmission wire of remote
controller.
30
Judgment and action
Open stop valve.
Check facility of power supply.
Correct the wiring (U·V·W phase) to
compressor. Refer to "9-6.TEST POINT
DIAGRAM" (Outdoor power circuit board).
Check indoor/outdoor fan.
Solve short cycle.
Replace outdoor controller circuit board.
Note:
Before the replacement of the outdoor
controller circuit board, disconnect the wiring
to compressor from the outdoor power circuit
board and check the output voltage among
phases, U, V, W, during test run.
No defect on board if voltage among phases
(U-V, V-W and W-U) is same. Make sure to
perform the voltage check with same
performing frequency.
Check compressor. Refer to "9-4. HOW TO
CHECK THE PARTS".
Replace outdoor power circuit board.
Check the DIP switch setting of outdoor
controller circuit board.
Check disconnection or looseness of indoor
unit or transmission wire of remote controller.
Check wiring of remote controller.
• Total wiring length: Max. 500 m
(Do not use cable with 3 or more cores.)
• The number of connecting indoor units:
Max. 6 units
• The number of connecting remote controller:
Max. 1 unit
If the cause of trouble is not in above
Diagnose remote controller (PAC-IF011B-E only).
a) When "OK" is displayed,
remote controllers have no problem.
Turn the power off, and on again to check.
If abnormality occurs again, replace indoor
controller board.
b) When "NG" is displayed,
replace remote controller.
c) When "E3" or "00-66" is displayed, noise
may be causing abnormality.
Note:
If the unit is not normal after replacing
indoor controller board in group control,
indoor controller board of address "0" may
be abnormal. For the controllers other than
PAC-IF011B-E, refer to Installation Manual
or Service Handbook of the indoor unit.
Replace remote controller.
The address changes to a separate setting.
– Diagnose remote controller (PAC-IF011B-E only).
a) When "OK" is displayed, remote controllers
have no problem.
Turn the power off, and on again to check.
When becoming abnormal again, replace
indoor controller board.
b) When "NG" is displayed, replace remote
controller.
c) When "E3" or "00-66" is displayed, noise
may be causing abnormality.
Note: For the controllers other than PAC-
IF011B-E, refer to Installation Manual or
Service Handbook of the indoor unit.
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