Mitsubishi SRK19CNS-S, Technical Manual, Page: 41 / 70

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'14•SRK-T-164
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Indoor unit display panel
TIMER
6-time
flash
ON
ON
ON
RUN
light
Keeps
flashing
Keeps
flashing
Keeps
flashing
(5) Self-diagnosis table
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.)
• Broken heat exchanger sensor
1 wire, poor connector
connection
• Indoor PCB is faulty
• Broken room temperature
sensor wire, poor connector
connection
• Indoor PCB is faulty
Heat exchanger
sensor 1 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 300min
-1
(rpm) or
• Defective fan motor, poor
connector connection
Indoor fan
motor error
–55ºC or lower is detected for 5 seconds continuously 3 times within
40 minutes after initial detection of this anomalous temperature.
Or –55ºC or lower 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 lower is detected for within 20 seconds after power ON.
(The compressor is stopped.)
• Broken heat exchanger sensor
wire, poor connector
connection
• Outdoor main PCB is faulty
Outdoor heat
exchanger
sensor error
–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.)
• Broken discharge pipe sensor
wire, poor connector
connection
• Outdoor main PCB is faulty
Discharge pipe
sensor error
gency stop caused by trouble in the outdoor unit, When there is an emer
or the input current value is found to be lower than the set value.
(The air conditioner stops.)
• Broken compressor wire
• Compressor blockage
Trouble of
outdoor unit
When the value of the discharge pipe sensor exceeds the set value.
(The air conditioner stops.)
• Gas shortage, defective
discharge pipe sensor, service
valve is closed
Over heat of
compressor
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).
• Defective power supply,
Broken signal wire, defective
indoor/outdoor sub PCB
Error of signal
transmission
Description
of trouble
Cause Display (flashing) condition
• Broken outdoor air temp.
sensor wire, poor connector
connection
• Outdoor main PCB is faulty
Outdoor air
temperature
sensor error
lower is measured for 30 seconds or longer. (The air conditioner stops.)
1-time
flash
2-time
flash
ON
ON
ON
5-time
flash
6-time
flash
light
2-time
flash
4-time
flash
2-time
flash
1-time
flash
Or –25ºC or lower is detected for within 20 seconds after power ON.