Mitsubishi Heavy Industries FDC508HES3 Owner's Manual Page 21
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8.6.3 Diagnosing of microcomputer circuit
(1) Selfdiagnosis function
(a) Indoor unit side
(i) Only case of wireless remote control model.
Error Code
Failure at: Contents of the failure
Defective connection or broken wire for operating switch signal wire.
Signal noise has entered the operating switch wire.
Is the circuit board for the operating switch or the circuit board for the indoor unit is defective
(communication circuit defective)?
Indoor unit heat exchanger thermistor defective (element defective or broken wire). Defective
connection of connector for thermistor.
Indoor unit return thermistor defective (element defective or broken wire). Defective connection
of connector for thermistor.
Indoor unit heat exchanger thermistor defective (short circuit).
Indoor unit circuit board defective (defective thermistor input circuit)?
Indoor unit circuit board defective (defective thermistor input circuit)?
Indoor unit circuit board defective (defective thermistor input circuit)?
Heating overload (temperature of heat exchanger for indoor unit abnormally high)
Indoor unit heat exchanger thermistor defective (short circuit).
Indoor unit circuit board defective (defective thermistor input circuit)?
Failure with the condensate pump (DM), or open circuit or disconnection of connector with the condensate pump.
Malfunctioning of the float switch (erroneous functioning)
Indoor unit circuit board defective (defective float switch input circuit)
Indoor unit circuit board defective (defective DM driving output circuit)
1 Remote controller for multiple unit control, 17 or more indoor units connected
Gas leak.
E1
E6
E7
E8
E9
E57
E10
Operating switch wire
(signal noise)
Circuit board for operating
switch or indoor unit
Indoor unit heat exchanger
thermistor
Indoor unit circuit board
Indoor unit air inlet thermistor
Indoor circuit board
Indoor unit heat exchanger thermistor
Indoor unit circuit board
Indoor unit circuit board
Installation and operating conditions
Indoor unit heat exchanger thermistor
Indoor unit circuit board
Failure in drainage
Float switch
Number of indoor units connected
Insufficient refrigerant
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Check indicator table
Table of inspection items based on error codes
Note (1) Inspection LED display has a cycle of 8 seconds (flashing time of 0.5 seconds).
(ii) Only case of wired remote control model.
Failure mode on the indoor unit indicated by flashing Yellow LED and Green LED.
Indoor unit LED
Indoor unit heat exchanger thermistor defective (element defective or broken wire).
Defective connection of connector for thermistor.
Indoor unit circuit board defective (defective thermistor input circuit)?
Indoor unit return thermistor defective (element defective or broken wire).
Defective connection of connector for thermistor.
Indoor unit circuit board defective (defective thermistor input circuit)?
Failure with the condensate pump (DM), or open circuit or disconnection of connector with the condensate pump.
Malfunctioning of the float switch (erroneous functioning)
Indoor unit circuit board defective (defective float switch input circuit)
Indoor unit circuit board defective (defective DM driving output circuit)
Gas leak.
Indoor unit heat exchanger thermistor defective (short circuit).
Indoor unit circuit board defective (defective thermistor input circuit)?
Heating overload (temperature of heat exchanger for indoor unit abnormally high)
Indoor unit heat exchanger thermistor defective (short circuit)?
Indoor unit circuit board defective (defective thermistor input circuit)?
1 time flash
2 time flashes
2 time flashes
4 time flashes
5 time flashes
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Yellow Green
Failure at: Contents of the failure
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6 time flashes
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Indoor unit air return thermistor
Indoor circuit board
Low voltage protection
Indoor unit heat exchanger
thermistor
Indoor unit circuit board
Indoor unit circuit board
Failure in drainage
Float switch
Insufficient refrigerant
Indoor unit heat exchanger thermistor
Indoor unit circuit board
Installation and operating conditions
Indoor unit heat exchanger thermistor
Indoor unit circuit board
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When the power source voltage is 80% of rating or lower.
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- SERVICE GUIDE 1
- RUN LAMP (GREEN) 3
- TIMER/CHECK (YELLOW) 3
- 1, 2) and a timer 8
- Indoor heat exchanger 9
- Heating operation 9
- Remote controller 11
- DRY COOL FAN HEAT AUTO 13
- Fan motor 14
- FDC(P)408, 508 typeModel 14
- FDC(P)208~308 type 14
- SV -close 15
- SV -open 15
- Discharge gas temp (°C) 15
- Error stop 16
- Operable 16
- SAFETY PRECAUTIONS 18
- 8.6 MAINTENANCE DATA 19
- Error Code 21
- ( ) 23
- ( ) 23
- Drain abnormality 24
- Heating overload 25
- Error display : 25
- Resistance (kΩ) 26
- 63H163H1 29
- 63H263H2 29
- Compressor 30
- Resistance 31
- Green LED 33
- 4 time flashes 33
- 1 time flash 33
- Outdoor unit 33
- 3D Air Sales Ltd 34
- 3D Air Sales (Ireland) Ltd 34
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