MITSUBISHI ELECTRIC MR-455R-W-A(NZ) - Manual (Page 19)

6.4 Malfunction Display and Checking points. 6.4.1 ) Malfunction display will use LED for show self-check 6.4.2 ) Fucntion display 6.4.3 ) Repairing and check point * A the case below , if the analysis result has malfunction over 2 points and will express in the list has more importance.
Function display
Cause
Analysis result
Check point
Corrective
Priority Repairing
2. Check the resistance of thermistor
Change part
2. Check the resistance of thermistor
Change part
2. Check the resistance of defrost heater
Change part
3. Check the resistance of temp. fuse
Change part
Caution 1. Before plug in the AC power , Be ensure the comp had been off more than 20 min.
Improve in contact Improve in contact
1. Check connector of control PCB CN1 , relay connector temp. fuse
3 2 1
Improve in contact
LED display self - check
Malfunction display
Lighting mode
1 time 2 times 3 times
Defrost unfinished with in 2 hours
Fault trouble of defrost thermistor Fault trouble of freezer thermistor Fault trouble of defrost heater
Open circuit or short circuit case Open circuit or short circuit case
- 18 -
2. The consider short circuit or open circuit of thermistor , resistance of open circuit is
∞
Ω
,
resistance of short circuit is
0
Ω
1. Check connector of control PCB CN5 , relay connector 6 pin 1. Check connector of control PCB CN5 , relay connector 2 pin
ON OFF
5 Sec.
Cycle
2 times
1 time
Cycle
Cycle
Cycle
5 Sec.
5 Sec.
5 Sec.
1 time
1 time
1 time
2 times
2 times
2 times