Mitsubishi SRK10CES, Technical Handbook

Page: 37 / 260

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35
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(e) Self-diagnosis table
When this air conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flashing of
display lights. If the air conditioner is operated using the remote control 3 minutes or more after the emergency stop, the trouble
display stops and the air conditioner resumes operation.
(1)
Notes (1) The air conditioner cannot be restarted using the remote control for 3 minutes after operation stops.
(2) Even if the easy clean flap is disconnected, if the indoor unit’s fan motor is not stopped, check the limit switch’s connector connection.
When a heat exchanger sensor wire disconnection is detected while
operation is stopped. (If a temperature of –20ºC or lower is detected for
12 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 –20ºC or lower is detected for
12 seconds, it is judged that the wire is disconnected.) (Not displayed
during operation.)
• Broken heat exchanger sensor
wire, poor connector
connection
• Broken room temperature
sensor wire, poor connector
connection
Heat exchanger
sensor error
Room
temperature
sensor error
When conditions for turning the indoor unit’s fan motor on exist during
air conditioner operation, an indoor unit fan motor speed of 300 rpm or
lower is measured for 30 seconds or longer. (The air conditioner stops.)
• Defective fan motor, poor
connector connection
Indoor fan
motor error
ON
1 time
flash
ON
2 time
flash
ON
6 time
flash
When an outdoor temperature sensor wire disconnection is detected
while operation is stopped. (If a temperature of –40ºC or lower is
detected for 12 seconds, it is judged that the wire is disconnected.) (Not
displayed during operation.)
• Broken outdoor air temp.
sensor wire, poor connector
connection
Outdoor air
temperature
sensor error
1 time
flash
Keeps
flashing
When a sensor wire disconnection is detected while operation is
stopped. (If a temperature of –50ºC or lower is detected for 12 seconds,
it is judged that the wire is disconnected.) (Not displayed during
operation.)
• Broken heat exchanger sensor
wire, poor connector
connection
Outdoor heat
exchanger
sensor error
2 time
flash
Keeps
flashing
When a compressor discharge pipe sensor wire disconnection is
detected for 12 seconds or longer (less than 7ºC) after the outdoor
unit’s speed has continued at 0 rps or higher for 9 minutes.
(The air conditioner stops.)
• Broken discharge pipe sensor
wire, poor connector
connection
Discharge pipe
sensor error
4 time
flash
Keeps
flashing
The inverter output current (compressor motor current) exceeds the set
value during compressor start.
(The air conditioner stops.)
• Compressor locking, open
phase on compressor output,
shortcircuit on power
transistor, closed service valve
Current Cut
1 time
flash
ON
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
continuously for 3 minutes or longer.
(The air conditioner stops.)
• Broken power transistor,
broken compressor wire
• Broken discharge pipe sensor
wire, poor connector
connection
• Compressor blockage
Trouble of
outdoor unit
2 time
flash
ON
When the value of the discharge pipe sensor exceeds the set value.
(The air conditioner stops.)
• Gas shortage, defective
discharge pipe sensor, closed
service valve
Over heat of
compressor
ON
5 time
flash
6 time
flash
ON
When there is no signal between the indoor unit’s board and outdoor
unit’s board for 10 seconds or longer (when the power is turned on), or
when there is no signal for 1 minute 50 seconds or longer (during
operation)(the compressor is stopped).
• Defective power supply,
Broken signal wire, defective
in/outdoor unit boards
Error of signal
transmission
If the compressor motor’s magnetic pole positions cannot be correctly
detected when the compressor starts.
(The air conditioner stops.) • Defective compressor
• Open phase on compressor
• Defective outdoor unit boards
Rotor lock
2 time
flash
2 time
flash
When the outdoor unit’s fan motor sped continues for 30 seconds or
longer at 75 rpm or lower. (3 times) (The air conditioner stops.) • Defective fan motor, poor
connector connection
Outdoor fan
motor error 7 time
flash
ON
Indoor unit display panel
Description
of trouble
Cause Display (flashing) condition
RUN
light
TIMER
light
When the inverter command speed is 30 rps or less and the current save
has operated. (the compressor stops)
• Overload operation
• Overcharge
• Compressor locking
Current safe
stop 3 time
flash
OFF
OFF
OFF
OFF
OFF
OFF
1 time
flash
2 time
flash
5 time
flash
6 time
flash
Keeps
flashing
ON
Safety switch operates.
(2)
(The air conditioner stops.)
• Defective safety switch
• Easy clean flap setting is
defective.
Trouble of
safety switch
Keeps
flashing
OFF
OFF
3 time
flash
ON
Outdoor
unit
LED