Self-Diagnosis Table - Mitsubishi SCM40ZS-S Technical Manual

(5) Self-diagnosis table

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Outdoor
Indoor unit display panel
main PCB
RUN TIMER
Red LED
light light
1-time Stays
ON
flash OFF
2-time Stays
ON
flash OFF
3-time Stays
ON
flash OFF
4-time Stays
ON
flash OFF
6-time Stays
ON
OFF
flash
Keeps 1-time 8-time
flashing flash flash
Keeps 2-time 8-time
flashing flash flash
Keeps 4-time 8-time
flashing flash flash
Keeps 5-time 8-time
flashing flash flash
1-time 1-time
ON
flash flash
2-time 2-time
ON
flash flash
3-time 3-time
ON
flash flash
4-time 1-time
ON
flash flash
5-time 5-time
ON
flash flash
6-time 6-time
ON
flash flash
7-time
ON ON
flash
Keeps 2-time
ON
flashing flash
2-time 2-time 7-time
flash flash flash
5-time 2-time
ON
flash flash
7-time 2-time
ON
flash flash
4-time
— —
flash
Stays
— —
OFF
Keeps
Stays
—
flashing
OFF
-
(3)SRR series only.
(4)This LED is installed on model SCM50ZS-S.
-
-
Wired
(4) (2)
remote Description
control
of trouble
display
• Broken heat exchanger sensor
Heat exchanger 1 wire, poor connector
—
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
• Anomalous float switch operation
trouble
• Defective indoor PCB faulty
Indoor fan • Defective fan motor, poor
E 16
motor error connector connection
• Broken outdoor air temp.
Outdoor air
sensor wire, poor connector
E 38 temperature
connection
sensor error
• Outdoor main PCB is faulty
• Broken heat exchanger sensor
Outdoor heat
wire, poor connector
E 37 exchanger
connection
sensor error
• Outdoor main PCB is faulty
• Broken discharge pipe sensor
Discharge pipe wire, poor connector
E 39
sensor error connection
• Outdoor main PCB is faulty
• Broken suction pipe sensor wire,
Outdoor suction
poor connector connection
E 53
pipe sensor error
• Outdoor sub PCB is faulty
• Compressor locking, open phase
on compressor output, short
E 42 Current cut
circuit on power transistor
service valve is closed
Trouble of • Broken compressor wire
E 59
outdoor unit • Compressor blockage
• Overload operation
Current safe
• Overcharge
E 58
stop
• Compressor locking
Power
E 51 transistor • Broken power transistor
error
• Gas shortage, defective
Over heat of
E 36
discharge pipe sensor, service
compressor
valve is closed
• Defective power source,
Error of signal
E 5
Broken signal wire, defective
transmission
indoor/outdoor sub PCB
Outdoor fan
• Defective fan motor, poor
E 48
motor error
connector connection
• Overload operation, overcharge
Cooling high
• Broken outdoor heat exchange
pressure
E 35
sensor wire
protection
• Service valve is closed
• Defective compressor
E 60 Rotor lock • Open phase on compressor
• Defective outdoor PCB
Active filter
• Defective active filter
E 47
voltage error
Refrigeration
• Service valve is closed.
cycle system
E 57
• Refrigerant is insuf
protective
control
• Outdoor sub PCB fauly
Outdoor sub PCB
communication
E 45 • Poor connection of wire between
error outdoor sub PCB – main PCB
Error of wired
• Broken wired remote control
E 1
remote control
wire, defective indoor PCB
wiring
• Defective limit switch
Limit switch
—
• Defective suction panel set
error
• Defective indoor control PCB
Cause 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 fan motor speed of 300
lower is measured for 30 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 emer
or the input current value is found to be lower than the set value.
(The air-conditioner stops.)
When the compressor speed is lower than the set value and
the current safe has operated. (the compressor stops)
When the power transistor is judged breakdown while compressor
starts.
(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 fan motor speed continues for 30 seconds or longer at
75 min or lower. (3 times)
-1
(The air-conditioner stops.)
When the value of the outdoor heat exchanger sensor exceeds the set
value.
If the compressor motor's magnetic pole positions cannot be correctly
detected when the compressor starts.
(The air-conditioner stops.)
When the wrong voltage connected for the power source.
When the outdoor main PCB is faulty
When refrigeration cycle system protective control operates.
ficient
Communication error for 15 minutes: Detected more than 15 seconds
4 times
The wired remote control wire Y is open. The wired remote
control wires X and Y are reversely connected. Noise is penetrating
the wired remote control lines. The wired remote control or indoor
PCB is faulty. (The communications circuit is faulty.)
Actuation of limit switch
200
- -
'16 • SCM-T-199
(SRF : 150) min
gency stop caused by trouble in the outdoor unit,
.
or
-1