Mitsubishi Heavy Industries FDT100VNAWVH Service Manual page 54

2) SRK series
2) SRK series
Remote control Indoor unit display
TIMER
Error code Red LED RUN light
light
Keeps
ON
flashing
5-time
ON
flash
Keeps 2-time
flashing flash
Keeps
1-time flash
flashing
Keeps 4-time
flashing
flash
ー ー
Keeps
flashing
ON 1-time flash
5-time
ON
flash
7-time
ON
flash
ー ー
4-time
ON
flash
Keeps 5-time
flashing flash
ー ー
7-time
ON
flash
ー ー
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.
(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
2) SRK series
Indoor unit display panel
Error code Red LED RUN light
－
Keeps flashing
Outdoor unit control PCB
Location of trouble
Red LED Green LED
Installation or operating
condition
Keeps
Outdoor heat exchanger
1-time flash
flashing
temperature sensor
Outdoor unit control PCB
Installation or operating
condition
Keeps
Temperature sensor
1-time flash
flashing
Outdoor unit control PCB
Outdoor heat exchanger
temperature sensor
Keeps
1-time flash
flashing
Outdoor unit control PCB
Outdoor air temperature
sensor
Keeps
1-time flash
flashing
Outdoor unit control PCB
Discharge pipe
temperature sensor
Keeps
1-time flash
flashing
Outdoor unit control PCB
Installation or operating
Keeps
condition
1-time flash
flashing
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective 63H1 input circuit)?
Outdoor control PCB
compressor
Keeps
1-time flash
flashing
Installation or operating
condition
Outdoor unit control PCB • Defective outdoor unit control PCB
Keeps
1 time flash
flashing
Outdoor fan motor
Keeps
1 time flash
flashing
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective motor input circuit)?
Installation or operating
condition
Keeps
1-time flash
Low pressure sensor
flashing
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective sensor input circuit)?
Keeps
1-time flash Inverter PCB
flashing
Suction pipe
temperature sensor
Keeps
1-time flash
flashing
Outdoor unit control PCB *• Defective outdoor unit PCB (Defective sensor input circuit)?
Low pressure sensor
Keeps
1-time flash
flashing
Outdoor unit control PCB • Defective outdoor unit control PCB (Defective sensor input circuit)?
Operation status
Keeps
1-time flash
flashing
Installation status
5-time Keeps Compressor,
flash flashing
inverter PCB
Outdoor unit control PCB
Green LED Red LED Green LED
Keeps flashing 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
TIMER light 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.
Description of trouble
• Higher outdoor heat exchanger temperature
• Defective outdoor heat exchanger temperature sensor
*• Defective outdoor unit control PCB (Defective temperature sensor input
circuit)?
• Higher discharge temperature
• Defective discharge pipe temperature sensor
*• Discharge pipe Defective outdoor unit control PCB (Defective temperature sensor input
circuit)?
• Defective outdoor heat exchanger temperature sensor, broken wire or poor
connector connection
*• Defective outdoor unit control PCB (Defective temperature sensor input
circuit)?
• Defective Outdoor air temperature sensor, broken wire or poor connector
connection
*• Defective outdoor unit control PCB (Defective temperature sensor input
circuit)?
• Defective discharge pipe temperature sensor, broken wire or poor
connector connection
*• Defective outdoor unit control PCB (Defective temperature sensor input
circuit)?
• Rising high pressure (Operation of 63H1) • Service valve closing operation
• Current cut (Anomalous compressor over-current)
• Service valve closing operation
• Defective
• Anomalous outdoor fan motor
• Low pressure error • Service valve closing operation
• Anomalous low pressure, broken wire of low pressure sensor or poor
connector connection
• Anomalous inverter PCB
• Defective suction pipe temperature sensor, broken wire or poor connector
connection
• Defective low pressure sensor
• Shortage in refrigerant quantity
• Service valve closing operation
•Anomalous compressor startup
Description of trouble
Description of trouble
53
- -
'19 • PAC-SM-309
Reference
Repair method
page
Repair
Replacement of
156
temperature thermistor
Replacement of PCB
Repair
Replacement, repair of
157
temperature thermistor
Replacement of PCB
Replacement, repair of
temperature thermistor
158
Replacement of PCB
Replacement, repair of
temperature thermistor
159
Replacement of PCB
Replacement, repair of
temperature thermistor
160
Replacement of PCB
Repair
161
Replacement of PCB
Replacement of PCB
162・163
Repair
Replacement of PCB 164
Replacement, repair
165
Replacement of PCB
Repair
Replacement, repair of
166・167
sensor
Replacement of control
PCB
Replacement of PCB 168
Replacement, repair of
temperature thermistor
169
Replacement of control
PCB
Replacement of sensor
170
Replacement of control PCB
Repair
171
Service valve opening
check
Replacement 172・173
Repair method
Replacement
Repair method
Replacement