When a heat exchanger temperature 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
temperature
sensor 1 wire,
poor connector connection
-
• Indoor unit PCB is faulty
• Broken room temperature
sensor wire, poor connector
connection
• Indoor unit PCB is faulty
Heat exchanger
temperature
sensor 1 error
Room temperature
sensor error
• 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 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.)
• Broken heat exchanger
temperature sensor wire,
poor connector connection
• Outdoor unit PCB is faulty
Outdoor heat
exchanger temperature
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
temperature sensor wire,
poor connector connection
• Outdoor unit PCB is faulty
Discharge pipe
temperature
sensor error
The compressor output current exceeds the set value during compressor
start.
(The air-conditioner stops.)
•
,
Compressor locking, open phase
on compressor output, short
circuit on power transistor
service valve is closed
Current cut
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.)
When the power transistor is judged breakdown while compressor
starts.
(The compressor is stopped.)
• Broken compressor wire
• Compressor blockage
Trouble of outdoor
unit
When the value of the discharge pipe temperature sensor exceeds the
set value.
(The air-conditioner stops.)
• Gas shortage, defective
discharge pipe temperature
sensor, service valve is closed
Over heat of
compressor
When there is no signal between the indoor unit PCB and outdoor unit 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 source,
Broken signal wire, defective
indoor/outdoor unit PCB
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 PCB
• Service valve is closed.
• Refrigerant is insufficient
Rotor lock
When the outdoor fan motor speed continues for 30 seconds or longer at
75 min
-1
or lower. (3 times)
(The air-conditioner stops.)
• Defective fan motor, poor
connector connection
Outdoor fan motor
error
Indoor unit display panel
Description
of trouble
Cause
Display (flashing) condition
When the compressor command speed is lower than the set value and
the current safe has operated. (the compressor stops)
• Overload operation
• Overcharge
• Compressor locking
Current safe stop
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 unit
PCB is faulty. (The communications circuit is faulty.)
• Broken wired remote control
wire, defective indoor unit PCB
Error of wired
remote control
wiring
• Broken power transistor
Power transistor
error
When a heat exchanger temperature 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.)
• Broken heat exchanger
temperature
sensor 2 wire,
poor connector connection
• Indoor unit PCB is faulty
Heat exchanger
temperature
sensor 2 error
When the value of the outdoor heat exchanger temperature sensor
exceeds the set value.
• Overload operation, overcharge
• Broken outdoor heat exchange
temperature sensor wire
• Service valve is closed
Cooling high pressure
protection
When the wrong voltage connected for the power source.
When the outdoor unit PCB is faulty
.
• Defective active filter
Active filter voltage
error
When refrigeration cycle system protective control operates.
Refrigeration cycle
system protective
control
ON
ON
ON
1-time
flash
5-time
flash
6-time
flash
2-time
flash
7-time
flash
TIMER
light
—
4-time
flash
3-time
flash
2-time
flash
ON
ON
ON
6-time
flash
ON
ON
ON
ON
2-time
flash
ON
RUN
light
—
ON
ON
3-time
flash
ON
5-time
flash
7-time
flash
E 16
• Broken outdoor air temperature
sensor wire, poor connector
connection
• Outdoor unit PCB is faulty
Outdoor air temperature
sensor error
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
E 38
E 37
E 39
E 42
E 59
E 36
E 5
E 60
E 47
E 48
E 35
E 1
E 58
E 51
Wired
(2)
remote
control
display
E 57
—
—
—
(5) Self-diagnosis table
When conditions for turning the indoor fan motor on exist during air-
conditioner operation, an indoor fan motor speed of 300 min
-1
or lower
is measured for 30 seconds or longer. (The air-conditioner stops.)
4-time
flash
2-time
flash
1-time
flash
2-time
flash
1-time
flash
-
-
-
'20 • SRF-SM-311
-
20
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