Mitsubishi Electric WSH-ZM35I BEDRAAD SET, Руководство по обслуживанию

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33
OCH751
Checkcode Abnormal points and detection method Cause Judgment and action
UP
(4210)
Compressor overcurrent interruption
Abnormal if overcurrent DC bus or com-
pressor is detected after compressor starts
operating for 30 seconds.
1
Stop valve of outdoor unit is closed.
2
Decrease of power supply voltage
3
Looseness, disconnection or reverse
of compressor wiring connection
4
Defective fan of indoor/outdoor units
5
Short cycle of indoor/outdoor units
6
Defective input circuit of outdoor
controller circuit board
7
Defective compressor
8
Defective outdoor controller circuit
board
9
DIP switch setting difference of out -
door controller circuit board
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 controller
circuit board).
4
Check indoor/outdoor fan.
5
Solve short cycle.
6
Replace outdoor controller circuit board.
7
Check compressor. Refer to "10-5. HOW
TO CHECK THE PARTS".
Note: Before the replacement of the outdoor con-
troller circuit board, disconnect the wiring to
compressor from the outdoor controller 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 frequen -
cy.
8
Replace outdoor controller circuit board
9
Check the DIP switch setting of outdoor
switch board.
E0
or
E4
Remote controller transmission error
(E0)/signal receiving error (E4)
1
Abnormal if main or sub remote control-
ler cannot receive normally any trans-
mission from indoor unit of refrigerant
address “0” for 3 minutes.
(Check code: E0)
2
Abnormal if sub remote controller could
not receive any signal for 2 minutes.
(Check code: E0)
1
Abnormal if indoor controller board
cannot receive normally any data from
remote controller board or from other
indoor controller board for 3 minutes.
(Check code: E4)
2
Indoor controller board cannot receive
any signal from remote controller for 2
minutes. (Check code: E4)
1
Contact failure at transmission wire
of remote controller
2
All remote controllers are set as “sub”
remote controller. In this case, E0 is
displayed on remote controller, and
E4 is displayed at LED (LED1, LED2)
on the outdoor controller circuit
board.
3
Miswiring of remote controller
4
Defective transmitting receiving cir-
cuit of remote controller
5
Defective transmitting receiving circuit
of indoor controller board of refriger-
ant address “0”
6
Noise has entered into the transmis-
sion wire of remote controller.
1
Check disconnection or looseness
of indoor unit or transmission wire of
remote controller.
2
Set one of the remote controllers “main”
if there is no problem with the action
above.
3
Check wiring of remote controller.
• Total wiring length: maximum 500 m
(Do not use cable with 3 or more cores.)
• The number of connecting indoor units:
maximum 16 units
• The number of connecting remote con-
troller: maximum 2 units
If the cause of trouble is not any of
1
–
3
above,
4
Diagnose remote controllers.
a) When “RC 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 “RC NG” is displayed, replace
remote controller.
c) When “RC E3” or “ERC 00-66” is dis-
played, noise may be causing abnor-
mality.
Note: If the unit is not normal after replacing
indoor controller board in group control,
indoor controller board of address “0” may
be abnormal.
E1
or
E2
Remote controller control board
1
Abnormal if data cannot be normally
read from the nonvolatile memory of the
remote controller control board.
(Check code: E1)
2
Abnormal if the clock function of remote
controller cannot be normally operated.
(Check code: E2)
1
Defective remote controller
1
Replace remote controller.