Self Diagnosis Function - Mitsubishi Heavy Industries SRR50ZJ-S Anwenderhandbuch

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
Description of trouble
Heat exchanger sensor 1 error
1 time flash
2 time flash
Room temperature sensor error
Heat exchanger sensor 3 error
3 time flash
4 time flash
Drain error
5 time flash Active filter voltage error
6 time flash Indoor fan motor error
Refrigerant is insufficient
7 time flash Closed service valve
Heat exchanger sensor 1 error
TIMER light
Outdoor temperature sensor error
1 time flash
Outdoor heat exchanger fluid pipe
2 time flash
sensor error
4 time flash Discharge pipe sensor error
Suction pipe sensor error
5 time flash
Current cut
1 time flash
2 time flash Trouble of outdoor unit
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
– 19 –
• Broken heat exchanger sensor 1 wire, poor connector
connection
• Broken room temperature sensor wire, poor connector connection
• Broken heat exchanger sensor 3 wire, poor connector
connection
• Drain at reverse gradient
• Float switch defective
• Defective power supply
• 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 supply, 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