Mitsubishi Electric MR-B46Z-W-C Service Manual page 26

Display
Error
Display
code
Tens place Ones place
E 33
E 34
E 50
E 51
E 52
E 53
E 55
E 56
E 57
*1: All the " ", " ", and "
*2: This operation is called the recovery operation:
If the damper has not operated ever once during the compressor operation, make the damper operate when the compressor stops.
*3: When the resistance is , the circuit is deemed open-circuited.
When the resistance is 0 , the circuit is deemed short-circuited.
*4: Once E01 is detected, other errors would be ignored and not displayed on the panel.
*5: Characteristic value may change in order to improve the product.
*6: The error codes E50 to E55 are not displayed even if those abnormalities occur when power is turned on.
Therefore, be sure to perform ice making test operation in order to check if any abnormality indicated by these error codes occurs. (See page 23.)
*7 : If those errors still continue for 1 minute after the restart, E56 will be displayed again.
OAH162
Detecting method
Trouble
(*3)
Trouble of ice The gear box operation
maker gear is not finished in 30 sec-
box onds.
Clogging of (T0: Defrost thermistor
refrigerant temperature at power
pipe or trou- input, T1: Defrost ther-
ble related to mistor temperature when
compressor 15 minutes have passed
from the power input)
•The difference between
T0 and T1 is T0 T1. (*5)
Trouble of • There is any trouble
inverter circuit in the circuit which
detects current of com-
(*6)
pressor.
Trouble of • The range of bus-bar volt-
bus-bar volt- age is not approx.
age 50 ~ 340 V DC.
(*6)
Trouble of • The inverter driving
inverter software software malfunctions.
reset function
(*6)
Trouble of • There is no current at
startup, syn- compressor startup.
chronization • The phase current
or overcurrent exceeds 5.5 A at com-
detection pressor startup.
(*6)
• The phase current
exceeds 3.3 A during
compressor operation.
• A current of 5.3 A or
more runs into the bus-
bar of control board.
EEPROM (IC11M)
Trouble of
control board accumulates data neces-
(EEPROM sary for control.
related • The data are not input
trouble) (*6) accurately.
• The microcomputer can-
not read the data.
Defective wir- The errors E50 to E53
ing connecting keep occurring over one
or trouble of and a half hour. (The
control board situation, which compres-
sor cannot be operated,
continues.)
Inverter drive The overcurrent error is
module abnor- detected before starting
mality the compressor (failure
of the IC in the inverter
drive module).
" indicators blink after button operation for ice making test operation or during ice making test operation.
Check point
1. Connector CN9S on control board, ice gear
box 6-pin wire to wire connector.
2. Ice gear box is frozen or has a sign of
frost.
3. Check the trouble of the ice gear box in
the ice making test operation.
Check the compressor and the pipe.
Refer to "Compressor does not operate" on page 34.
Refer to "Compressor does not operate" on page 35.
26
Corrective
Control
measures
Repair the 100 minutes later, the
contact failure. gear box is reactivated to
be checked again.
Replace.
Replace.
When cooling operation
returns to normal condi-
tion, the display of error
code disappears.
Replace the
control
board.
The compressor is
stopped and reactivated
10 minutes later.
Replace the
If abnormality occurs when
control
power is turned on, the com-
board.
pressor is stopped for
10 minutes.
When abnormality occurs
during normal operation, the
compressor keeps operating.
• The error display starts after
the error is determined as E56.
• The error display continues
until defrosting starts or cool-
ing operation gets back to nor-
mal. (The error display does
not disappear by unplugging
and plugging the power cord.
*7)
• An attempt to restart the com-
pressor is repeated every
3 minutes.
Replace the An attempt to restart the
control compressor is repeated
board. every 3 minutes.