Led Trouble Display And Check Point - Mitsubishi Electric MR-FT35EH-SW-C Service Manual

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)
- For ones' place, LED will light for 0.3s.(Short light period)
Example of error code 12 as shown in below timeline.
Tens' place
LED ON
LED OFF
0.9 s 0.3 s
1 CYCLE
Table shown error code
ERROR CODE
Trouble
Tens' Ones'
place place
0 2
Communication
error of inverter
1 1
Trouble of freezer
thermistor
1 2
Trouble of defrost
thermistor
1 3
Trouble of refrigerator
thermistor
1 8
Trouble of outside air
thermistor
(NOTE 2)
3 1
Trouble of freezer fan
motor
3 2
Trouble of BOX FAN
- Time period while LED off inside its cycle was 0.3 s
- Time period while LED off between each cycle was 3 s
Ones' place
0.3 s 0.3 s 0.3 s
Detecting method
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.)
When there is a short or open circuit in
the
refrigerator compartment thermistor.
(NOTE2)
When there is a short or open circuit in
the defrost thermistor.
When there is a short or open circuit in
the
F-room thermistor.
When there is a short or open circuit in
the outside air thermistor.
When motor doesn't rotate even though
power is on
When motor doesn't rotate even though
power is on
3 s
Check point
1. Connector CN9S on control
board,
2. Check the resistance of thermistor.>Replace.
1. Connector CN9S on control board,
4-pin wire to wire connector
2. Check the resistance of thermistor. >Replace.
1. Connector CN9S on control board,
4-pin wire to wire connector
2. Check the resistance of thermistor. >Replace.
1.Connector CN9S and CN5D
on control board, fan motor 4-pin
wire to wire connector
2.Check fan motor operation.
1.Connector CN9S and CN5D
on control board, fan motor 4-pin
wire to wire connector
2.Check BOX FAN operation.
15
T ens' place Ones' place
0.9 s 0.3 s 0.3 s
1 CYCLE
How to fix Control
Compressor turns OFF.
>Replace the
control board
>Repair the After compressor off, the compressor
contact failure. repeats 30-minute ON and 20-minute
OFF
>Repair the The defrost heater won't be turned ON.
contact failure.
>Repair the Synchronize the open/close status of R
contact failure. damper with that of compressor
>Replace Control it by refering to outside temp at
OPERATION 25 ºC.
PCB
>Repair the * 3 minutes later, the fan motor is
contact failure. reactivated to be checked.
>Replace.
* Until the fan motor gets to operate
correctly, the buzzer sounds every time
the door is closed.
>Repair the * 3 minutes later, the fan motor is
contact failure. reactivated to be checked.
>Replace.
* Until the fan motor gets to operate
correctly, the buzzer sounds every time
the door is closed.
LED self
check
0.3 s 0.3 s