Mitsubishi Electric MR-FT35EH-SW-C, Service Manual, Page: 16 / 39

MR-FT35EH,MR-FT46EH,MR-FT51EH
6.3 LED trouble display and check point.
1) Trouble is indicated by the blinking number of self-check LED(Red color) which locate
at near dial of control panel(The detail picture as shown in right side.)
The blinking number of self-check LED specifies the trouble which has occurred.
LED repeats to blinks as many times as the number specified for each trouble cycle.
Rule for convert error code from LED to numerical data as below :
- For ten's place, LED will light for 0.9s.(Long light period)
- Time period while LED off inside its cycle was 0.3 s
- For ones' place, LED will light for 0.3s.(Short light period) - Time period while LED off between each cycle was 3 s
Example of error code 12 as shown in below timeline.
Table shown error code
Tens'
place
Ones'
place
0 2 Compressor turns OFF.
1 1
2. Check the resistance of thermistor.>Replace.
1 2
2. Check the resistance of thermistor. >Replace.
1 3
2. Check the resistance of thermistor. >Replace.
1 8
3 1
>Replace.
3 2
2.Check BOX FAN operation. >Replace.
Trouble of BOX FAN When motor doesn’t rotate even though
power is on 1.Connector CN9S and CN5D
on control board, fan motor 4-pin
wire to wire connector >Repair the
contact failure. * 3 minutes later, the fan motor is
reactivated to be checked.
* Until the fan motor gets to operate
correctly, the buzzer sounds every time
the door is closed.
Trouble of freezer fan
motor When motor doesn’t rotate even though
power is on 1.Connector CN9S and CN5D
on control board, fan motor 4-pin
wire to wire connector
2.Check fan motor operation. >Repair the
contact failure. * 3 minutes later, the fan motor is
reactivated to be checked.
* Until the fan motor gets to operate
correctly, the buzzer sounds every time
the door is closed.
Trouble of refrigerator
thermistor When there is a short or open circuit in
the
F-room thermistor. 1. Connector CN9S on control board,
4-pin wire to wire connector >Repair the
contact failure. Synchronize the open/close status of R
damper with that of compressor
Trouble of outside air
thermistor
(NOTE 2) When there is a short or open circuit in
the outside air thermistor. >Replace
OPERATION
PCB Control it by refering to outside temp at
25 ºC.
After compressor off, the compressor
repeats 30-minute ON and 20-minute
OFF
Trouble of defrost
thermistor When there is a short or open circuit in
the defrost thermistor. 1. Connector CN9S on control board,
4-pin wire to wire connector >Repair the
contact failure. The defrost heater won’t be turned ON.
Communication
error of inverter A commutation error occurs between
refrigerator control circuit and inverter
control circuit in control board. (They
do not transmit and receive data for 10
seconds.) >Replace the
control board
Trouble of freezer
thermistor When there is a short or open circuit in
the
refrigerator compartment thermistor.
(NOTE2) 1. Connector CN9S on control
board, >Repair the
contact failure.
ERROR CODE
Trouble Detecting method Check point How to fix Control
LED self
check
Tens' place Ones' place T ens' place Ones' place
0.9 s 0.3 s 0.3 s 0.3 s 0.3 s 3 s 0.9 s 0.3 s 0.3 s 0.3 s 0.3 s
1 CYCLE 1 CYCLE
LED ON
LED OFF
15