Mitsubishi Heavy Industries DXK09Z6-W, User Manual

EN-23

Self diagnosis function

■

We are constantly trying to do better service to our customers by installing such judges that show abnormality of each function as follows

RUN light

TIMER light ON

1-time flash

2-time flash

5-time flash

7-time flash

6-time flash

Description of trouble

Cause

Indoor heat exchanger sensor 1 
error

Room temperature sensor error

Circuit error

Indoor fan motor error

Refrigerant is insufficient
Closed service valve

•  Broken heat exchanger sensor 1 wire, poor connector 

connection

•  Broken room temperature sensor wire, poor connector 

connection

•  Circuit failure or poor connector connection

•  Defective fan motor, poor connector connection

•  Refrigerant is insufficient, leaking

•  Closed service valve

TIMER light

4-time flash

2-time flash

1-time flash

3-time flash

2-time flash

1-time flash

4-time flash

5-time flash

6-time flash

7-time flash

Keep flashing

2-time flash

RUN light keeps flashing

RUN light ON

RUN light 2-time flash

Outdoor temperature sensor error

Outdoor heat exchanger sensor 
error

Discharge pipe sensor error

•  Broken outdoor sensor wire, poor connector connection

•  Broken heat exchanger sensor wire, poor connector 

connection

•  Broken discharge pipe sensor wire, poor connector connection

Current cut

Trouble of outdoor unit

Over current

Power transistor error

Over heat of compressor

Error of signal transmission

Outdoor fan motor error

Cooling high pressure protection

•  Compressor locking, open phase on compressor output, 

short circuit on power transistor, closed service valve 

•  Broken compressor wire
• Compressor 

blockage

•  Overload operation, overcharge of refrigerant

•  Broken power transistor

•  Gas shortage, defective discharge pipe sensor, 

closed service valve

•  Defective power source, broken signal wire, defective 

indoor/outdoor unit boards

•  Defective fan motor, poor connector connection

•  Overcharge of refrigerant, short circuit of outdoor unit

Rotor lock

• Defective 

compressor

•  Open phase on compressor

•  Defective outdoor unit boards

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9/25/2018   11:57:43 AM