Self Diagnosis Function - Mitsubishi Heavy Industries SKM20ZSP-S User Manual

Self diagnosis function

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We are constantly trying to do better service to our customers by installing such judges that show abnormality of each function as follows:
TIMER light ON
RUN light keeps flashing
RUN light ON
RUN light 2-time flash
RUN light
Heat exchanger sensor 1 error
1-time flash
Room temperature sensor error
2-time flash
Heat exchanger sensor 3 error
3-time flash
5-time flash
Active filter voltage error
6-time flash
Indoor fan motor error
Refrigerant is insufficient
Closed service valve
7-time flash
Heat exchanger sensor 1 error
TIMER light
Outdoor temperature sensor error
1-time flash
Outdoor heat exchanger fluid
2-time flash
pipe sensor error
Discharge pipe sensor error
4-time flash
5-time flash Suction pipe sensor error
Current cut
1-time flash
Trouble of outdoor unit
2-time flash
Over current
3-time flash
Power transistor error
4-time flash
5-time flash Over heat of compressor
Error of signal transmission
6-time flash
7-time flash
Outdoor fan motor error
Keep flashing
Cooling high pressure protection
2-time flash Rotor lock
Description of trouble
• Broken heat exchanger sensor wire, poor connector
connection
• Broken room temperature sensor wire, poor connector
connection
• Broken heat exchanger sensor 3 wire, poor connector
connection
• Defective power source
• Defective fan motor, poor connector connection
• Refrigerant is insufficient, leaking
• Closed serice valve
• Broken heat exchanger sensor 1 wire, poor connector
connection
• Broken outdoor sensor wire, poor connector connection
• Broken heat exchanger fluid pipe sensor wire, poor
connector connection
• Broken discharge pipe sensor wire, poor connector
connection.
•
Broken suction pipe sensor wire, poor connector connection
• Compressor locking, open phase on compressor output,
shortcircuit on power transistor, closed service valve
• Broken power transistor, broken compressor wire
• Broken discharge pipe sensor wire, poor connector connection
• Compressor blockage
• Overload operation, overcharge
• Broken power transistor
• Gas shortage, defective discharge pipe sensor, closed
service valve
• Defective power source, Broken signal wire, defective in/
outdoor unit boards
• Defective fan motor, poor connector connection
• Gas over charge, short circuit of outdoor unit
• Defective compressor
• Open phase on compressor
• Defective outdoor unit boards
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Cause