Mitsubishi FDT100VNXWVH Service Manual page 55

2) SRK series
Remote control Remote control Indoor unit display Indoor unit display
TIMER TIMER
Error code Red LED RUN light Error code Red LED RUN light
light light
Keeps Keeps
ON ON
flashing flashing
5-time 5-time
ON ON
flash flash
Keeps Keeps 2-time 2-time
flash
flashing flashing flash
Keeps
Keeps
1-time flash 1-time flash
flashing flashing
Keeps Keeps 4-time 4-time
flashing flashing flash flash
— — — —
— — — —
Keeps Keeps
flashing
flashing
ON ON 1-time flash 1-time flash
— — — —
7-time
7-time
ON ON
flash flash
— — — —
4-time
4-time
ON ON
flash flash
Keeps Keeps 5-time 5-time
flashing flash
flashing flash
— — — —
7-time 7-time
ON ON
flash flash
— — — —
Note (1) * mark in the Description of trouble means that, in ordinary diagnosis, it cannot identify the cause definitely, and, if the trouble is repaired by replacing the part, it
Note (1) * mark in the Description of trouble means that, in ordinary diagnosis, it cannot identify the cause definitely, and, if the trouble is repaired by replacing the part, it
is judged consequently that the replaced part was defective.
is judged consequently that the replaced part was defective.
(iii) Option control in-use
1) FDT, FDTC, FDU, FDUM, FDE series
Indoor unit control PCB
Error code Red LED Red LED
Keeps flashing Stays OFF Keeps flashing
2) SRK series
Indoor unit display panel
Indoor unit display panel
Error code Red LED RUN light
Error code Red LED RUN light
Keeps flashing Keeps flashing
－ －
Outdoor unit control PCB Outdoor inventer PCB Outdoor unit control PCB Outdoor inventer PCB
Red LED Green LED Red LED Green LED Yellow LED Yellow LED
Keeps Keeps
1-time flash 1-time flash
flashing flashing
Keeps Keeps
1-time flash 1-time flash
flashing flashing
Keeps Keeps
Keeps Keeps
flashing
flashing
1-time flash 1-time flash
flashing flashing
Keeps
Keeps
1-time flash 1-time flash
flashing flashing
Keeps Keeps
1-time flash 1-time flash
flashing
flashing
Keeps Keeps
1-time flash
1-time flash
flashing flashing
Keeps Keeps
1-time flash 6-time flash
1-time flash 6-time flash
flashing flashing
Keeps Keeps
1-time flash 1-time flash
1-time flash 1-time flash
flashing flashing
Keeps Keeps
1-time flash 1-time flash
flashing flashing
Keeps Keeps
1-time flash 1-time flash
flashing flashing
Keeps Keeps
flashing flashing
Keeps
Keeps
1-time flash 1-time flash
flashing flashing
Keeps
Keeps
1-time flash 1-time flash 6-time flash 6-time flash
flashing flashing
Keeps Keeps
1-time flash 1-time flash
flashing flashing
Keeps Keeps
Keeps Keeps
1-time flash 1-time flash
flashing flashing
flashing
flashing
Keeps Keeps
1-time flash 1-time flash
flashing flashing
Keeps Keeps
5-time flash 5-time flash Stays OFF Stays OFF
flashing flashing
Outdoor unit control PCB
Green LED Red LED Green LED
Stays OFF Keeps flashing • Communication error (Defective communication circuit on the main unit of SC-SL2NA-E or SC-SL4-AE/BE) ete.
Outdoor unit control PCB
Outdoor unit control PCB
TIMER light Red LED Green LED
TIMER light Red LED Green LED
Stays OFF Stays OFF Keeps flashing Keeps flashing
－ －
Location of trouble Location of trouble
Installation or operating Installation or operating
• Higher outdoor heat exchanger temperature • Higher outdoor heat exchanger temperature
condition
condition
Outdoor heat exchanger Outdoor heat exchanger
• Defective outdoor heat exchanger temperature sensor • Defective outdoor heat exchanger temperature sensor
temperature thermistor temperature thermistor
*• Defective outdoor unit control PCB (Defective temperature sensor input *• Defective outdoor unit control PCB (Defective temperature sensor input
Outdoor unit control PCB Outdoor unit control PCB
circuit)? circuit)?
Installation or operating Installation or operating
• Higher discharge temperature • Higher discharge temperature
condition condition
temperature sensor temperature sensor
• Defective discharge pipe temperature sensor • Defective discharge pipe temperature sensor
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective temperature sensor input circuit)? Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective temperature sensor input circuit)?
Outdoor heat exchanger • Defective outdoor heat exchanger temperature sensor, broken wire or poor
Outdoor heat exchanger • Defective outdoor heat exchanger temperature sensor, broken wire or poor
temperature thermistor temperature thermistor connector connection connector connection
*• Defective outdoor unit control PCB (Defective temperature sensor input *• Defective outdoor unit control PCB (Defective temperature sensor input
Outdoor unit control PCB
Outdoor unit control PCB
circuit)? circuit)?
Outdoor air temperature Outdoor air temperature • Defective outdoor air temperature sensor broken wire or poor connector • Defective outdoor air temperature sensor broken wire or poor connector
thermistor connection
thermistor connection
*• Defective outdoor unit control PCB (Defective temperature sensor input *• Defective outdoor unit control PCB (Defective temperature sensor input
Outdoor unit control PCB Outdoor unit control PCB
circuit)? circuit)?
Discharge pipe Discharge pipe • Defective discharge pipe temperature sensor broken wire or poor connector • Defective discharge pipe temperature sensor broken wire or poor connector
temperature sensor temperature sensor connection connection
*• Defective outdoor unit control PCB (Defective temperature sensor input
*• Defective outdoor unit control PCB (Defective temperature sensor input
Outdoor unit control PCB Outdoor unit control PCB
circuit)? circuit)?
Installation or operating Installation or operating
• Rising high pressure (Operation of 63H1) • Service valve closing operation
• Rising high pressure (Operation of 63H1) • Service valve closing operation
condition condition
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective 63H input circuit)? Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective 63H input circuit)?
Inverter PCB or radiator Inverter PCB or radiator
• Power transistor overheat
• Power transistor overheat
fin fin
Outdoor unit control Outdoor unit control
• Current cut (Anomalous compressor over-current)
• Current cut (Anomalous compressor over-current)
PCB compressor PCB compressor
Installation or operating Installation or operating
• Service valve closing operation • Service valve closing operation
condition
condition
Outdoor unit control PCB • Anomalous outdoor unit control PCB communication Outdoor unit control PCB • Anomalous outdoor unit control PCB communication
Inverter PCB • Anomalous inverter PCB communication
Inverter PCB • Anomalous inverter PCB communication
Outdoor fan motor Outdoor fan motor • Anomalous outdoor fan motor • Anomalous outdoor fan motor
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective motor input circuit)? Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective motor input circuit)?
Installation or operating
Installation or operating
• Low pressure error • Service valve closing operation • Low pressure error • Service valve closing operation
condition condition
• Anomalous low pressure, broken wire of low pressure sensor or poor
• Anomalous low pressure, broken wire of low pressure sensor or poor
Low pressure sensor Low pressure sensor
connector connection connector connection
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective sensor input circuit)? Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective sensor input circuit)?
Inverter PCB Inverter PCB • Anomalous inverter PCB • Anomalous inverter PCB
Suction pipe • Defective suction pipe temperature sensor, broken wire or poor connector
Suction pipe • Defective suction pipe temperature sensor, broken wire or poor connector
temperature sensor temperature sensor connection connection
Outdoor unit control PCB *• Defective outdoor unit PCB (Defective sensor input circuit)?
Outdoor unit control PCB *• Defective outdoor unit PCB (Defective sensor input circuit)?
Low pressure sensor Low pressure sensor • Defective low pressure sensor • Defective low pressure sensor
Outdoor unit control PCB • Defective outdoor unit control PCB (Defective sensor input circuit)? Outdoor unit control PCB • Defective outdoor unit control PCB (Defective sensor input circuit)?
Operation status Operation status • Shortage in refrigerant quantity • Shortage in refrigerant quantity
Installation status Installation status • Service valve closing operation • Service valve closing operation
Compressor, Compressor,
•Anomalous compressor startup •Anomalous compressor startup
inverter PCB inverter PCB
Description of trouble
Description of trouble
Description of trouble
• Communication error (Defective communication circuit on the main unit of SL2NA-E or SC-SL4-AE/BE) ete. • Communication error (Defective communication circuit on the main unit of SL2NA-E or SC-SL4-AE/BE) ete.
54
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'20 • PAC-SM-351
Description of trouble Description of trouble
Reference
Reference
Repair method Repair method
page page
Repair Repair
Replacement of Replacement of
153 153
temperature thermistor temperature thermistor
Replacement of PCB Replacement of PCB
Repair Repair
Replacement, repair of Replacement, repair of
154 154
temperature thermistor temperature thermistor
Replacement of PCB Replacement of PCB
Replacement, repair of
Replacement, repair of
temperature thermistor temperature thermistor
155 155
Replacement of PCB
Replacement of PCB
Replacement, repair of Replacement, repair of
temperature thermistor
temperature thermistor
156 156
Replacement of PCB Replacement of PCB
Replacement, repair of Replacement, repair of
temperature thermistor temperature thermistor
157 157
Replacement of PCB Replacement of PCB
Repair
Repair
158 158
Replacement of PCB Replacement of PCB
Replacement of PCB Replacement of PCB
159 159
or Repair or Repair
Replacement of PCB
Replacement of PCB
160・161 160・161
Repair Repair
Replacement of PCB 162 162
Replacement of PCB
Replacement, repair Replacement, repair
163 163
Replacement of PCB Replacement of PCB
Repair Repair
Replacement, repair of
Replacement, repair of
164 ・165 164 ・165
sensor sensor
Replacement of control Replacement of control
PCB PCB
Replacement of PCB Replacement of PCB 166 166
Replacement, repair of
Replacement, repair of
temperature thermistor temperature thermistor
167 167
Replacement of control Replacement of control
PCB PCB
Replacement of sensor Replacement of sensor
168 168
Replacement of control Replacement of control
PCB PCB
Repair Repair
169
169
Service valve opening Service valve opening
check
check
Replacement Replacement 170・171 170・171
Repair method
Replacement
Repair method
Repair method
Replacement Replacement