Mitsubishi SCM40ZJ-S Service Manual page 54

(ii) SCM100,125
Wired
Outdoor
Indoor unit display panel
remote
main PCB
controller
RUN TIMER
Red LED
display
light light
1 time Stays
ON
flash OFF
2 times Stays
ON
flash OFF
3 times Stays
ON
flash OFF
4 times Stays
ON
flash OFF
6 times Stays
ON
E 16
flash OFF
Keeps 1 time 8 times
E 38
flashing flash flash
Keeps 2 times 8 times
E 37
flashing flash flash
Keeps 4 times 8 times
E 39
flashing flash flash
Keeps 5 times 8 times
E 53
flashing flash flash
1 time 1 time
ON E 42
flash flash
2 times 2 times
ON E 59
flash flash
4 times 1 time
ON E 51
flash flash
5 times 5 times
ON E 36
flash flash
6 times 6 times
ON E 5
flash flash
7 times Keeps
ON
E 48
flash flashing
Keeps 2 times
ON
E 35
flashing flash
7 times 2 times
ON
E 57
flash flash
1 time
— — E 41
flash
2 times
— —
E 40
flash
4 times
—
—
E 45
flash
8 times
— —
E 54
flash
Stays
E 1
— —
OFF
Stays Keeps
—
OFF flashing
Notes (1) The air conditioner cannot be restarted using the remote controller for 3 minutes after operation stops.
(2) The wired remote controller is optional parts.
(3) SRR series only.
(2)
Description
Cause
of trouble
• Broken heat exchanger sensor
1 wire, poor connector
Heat exchanger
—
connection
sensor 1 error
• Indoor PCB is faulty
• Broken room temperature
Room
sensor wire, poor connector
—
temperature
connection
sensor error
• Indoor PCB is faulty
• Broken heat exchanger sensor
2 wire, poor connector
Heat exchanger
—
connection
sensor 2 error
• Indoor PCB is faulty
• Defective drain pump (DM),
broken drain pump wire
Drain
(3)
E 9
•Anomalousfloat s witchoperation
trouble
• Defective indoor PCB faulty
Indoor fan • Defective fan motor, poor
connector connection
motor error
• Broken outdoor air temp.
Outdoor air
sensor wire, poor connector
temperature
connection
sensor error
• Outdoor main PCB is faulty
• Broken heat exchanger sensor
Outdoor heat
wire, poor connector
exchanger
connection
sensor error
• Outdoor main PCB is faulty
• Broken discharge pipe sensor
Discharge pipe
wire, poor connector
connection
sensor error
• Outdoor main PCB is faulty
• Broken suction pipe sensor wire,
Outdoor suction
poor connector connection
pipe sensor error
• Outdoor sub PCB is faulty
• Compressor locking, open phase
on compressor output, short
Current cut
circuit on power transistor,
service valve is closed
Trouble of • Broken compressor wire
• Compressor blockage
outdoor unit
Inverter and • Outdoor inverter PCB is faulty
• Outdoor controol PCB is faulty
fan motor
anomaly • Outdoor fan motor is faulty
• Gas shortage, defective
Over heat of
discharge pipe sensor, service
compressor
valve is closed
• Defective power supply,
Error of signal
Broken signal wire, defective
transmission
indoor/outdoor sub PCB
Outdoor fan
• Defective fan motor, poor
motor error connector connection
• Overload operation, overcharge
Cooling high
• Broken high pressure sensor
pressure
wire
protection
• Service valve is closed
Refrigeration
• Service valve is closed.
cycle system
• Refrigerant is insufficient
protective
control
Power transistor
• Power transistor overheat
error
• Overload operation, overcharge
Heating high
• Broken high pressure sensor
pressure
wire
protection
• Service valve is closed
• Outdoor sub PCB fauly
Outdoor sub PCB
communication • Poor connection of wire between
outdoor sub PCB – main PCB
error
High pressure
• Broken high pressure sensor
sensor error wire
Error of wired
• Broken wired remote controller
remote controller
wire, defective indoor PCB
wiring
• Defective limit switch
Limit switch
—
• Defective suction panel set
error
• Defective indoor control PCB
Display (flashing) condition
When a heat exchanger sensor 1 wire disconnection is detected while
operation is stopped. (If a temperature of –28ºC or lower is detected for
15 seconds, it is judged that the wire is disconnected.)
(Not displayed during operation.)
When a room temperature sensor wire disconnection is detected while
operation is stopped. (If a temperature of –45ºC or lower is detected for
15 seconds, it is judged that the wire is disconnected.)
(Not displayed during operation.)
When a heat exchanger sensor 2 wire disconnection is detected while
operation is stopped. (If a temperature of –28ºC or lower is detected for
15 seconds, it is judged that the wire is disconnected.)
(Not displayed during operation.)
If the float switch OPEN is defected for 3 seconds continuously or if
float switch connector or wire is disconnected.
When conditions for turning the indoor unit's fan motor on exist during air
conditioner operation, an indoor unit fan motor speed of 300 (SRF : 150) rpm
or lower is measured for30 seconds or longer. (The air conditioner stops.)
–55ºC or lower is detected for 5 seconds continuously 3 times within
40 minutes after initial detection of this anomalous temperature.
Or –55ºC or higher is detected for within 20 seconds after power ON.
(The compressor is stopped.)
–55ºC or lower is detected for 5 seconds continuously 3 times within
40 minutes after initial detection of this anomalous temperature.
Or –55ºC or higher is detected for within 20 seconds after power ON.
(The compressor is stopped.)
–25ºC or lower is detected for 5 seconds continuously 3 times within 40
minutes after initial detection of this anomalous temperature.
(The compressor is stopped.)
–55ºC or lower is detected for 5 seconds continuously 3 times within 40
minutes after initial detection of this anomalous temperature.
Or –55ºC or higher is detected for within 20 seconds after power ON.
(The compressor is stopped)
The compressor output current exceeds the set value during compressor
start.
(The air conditioner stops.)
When there is an emergency stop caused by trouble in the outdoor unit,
or the input current value is found to be lower than the set value.
(The air conditioner stops.)
When power transistor anomaly is detected for 15 minutes continuosly
(The compressor is stopped.)
When the value of the discharge pipe sensor exceeds the set value.
(The air conditioner stops.)
When there is no signal between the indoor PCB and outdoor PCB for
10 seconds or longer (when the power is turned on), or when there is no
signal for 7 minute 35 seconds or longer (during operation)(the
compressor is stopped).
When the outdoor unit's fan motor speed continues for 30 seconds or
longer at 75 rpm or lower. (3 times) (The air conditioner stops.)
When anomalous rise of the high pressure sensor is detected 5 times
within 1 hour.
When high pressure sensor anomaly is detected for 10 minutes
continuously.
When refrigeration cycle system protective control operates.
When anomalous rise of the power transistor temperature is detected
2 times within 1 hour.
When anomalous rise of the high pressure sensor is detected 5 times
within 1 hour.
When high pressure sensor anomaly is detected for 10 minutes
continuously.
Communication error for 15 minutes: Detected more than 15 seconds
4 times.
If the detected for 5 second continuously within 2 minutes to 2 minutes
and 20 seconds after the compressor ON, the compressor stops.
The wired remote controller wire Y is open. The wired remote
controller wires X and Y are reversely connected. Noise is penetrating
the wired remote controller lines. The wired remote controller or indoor
PCB is faulty. (The communications circuit is faulty.)
Actuation limit switch

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'11 • SCM-SM-110