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265
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'20 • KX-T-373
E53
E53
Suction pipe temperature sensor anomaly
(Tho-S)
Stays Off
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
Is connection
of sensor connector
OK?
Are the
characteristics of
sensor OK?
* Check several times the temperature-resistance characteristics of
sensor a few times to find out any poor connection.
Suction pipe temperature sensor (Tho-S)
Temperature-resistance characteristics of
Save data for 30 minutes before stopping in Mente PC.
NO
NO
YES
Temperature (°C)
5kΩ at 25°C
Temperature sensor resistance (kΩ)
Check and save the data of
operating condition.
Check the conditions
whether it occurs
immediately after the
power on or during
operation or stopping.
Check the sensed value as
well.
Compare the temperature
on Mente PC with actual
measured value.
Replace sensor.
Replace control PCB.
2. Error detection method
Detection of anomalously low
temperature (resistance)
3
.
Condition of error displayed
• If -50°C is detected for 5
seconds within 2-minutes to
2-minutes 20-seconds after
the compressor ON and if this
anomaly occurs 3 times within
40 minutes after the initial
detection.
• If this anomaly occurs 1 time
within 20 seconds after power
ON.
4. Presumable cause
• Disconnection of the sensor
harness or the internal wire
of sensing part (Check the
molded part.)
• Disconnection of the sensor
connector
• Defective outdoor unit control
PCB
Note:
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
YESYES
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
E54
E54
High pressure sensor anomaly (PSH) /
Low pressure sensor anomaly (PSL)
Keeps flashing
Stays Off
Keeps flashing
*1
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
Is anomalous
pressure detected?
Is the
connector of the
sensor inserted
properly to the connector on
the outdoor control
PCB?
Save data for 30 minutes before stopping in Mente PC
Reset the power and restart operation.
Check the data for 30 minutes before stopping
High pressure sensor
output characteristics
Sensor output Black (GND) – White; Output voltage (Black – Red; DC5V)
Pressure (MPa) Pressure (MPa)
Low pressure sensor
output characteristics
E54
Does it recur?
Does
the pressure
converted from the
sensor output voltage match the
actual pressure measure
by pressure
gauge?
Output voltage (V)
Output voltage (V)
Check and save the data of
operating conditions.
Check the conditions
whether it occurs
immediately after the
power on or during
operation or stopping.
Check the sensed value.
Insert the connector
securely and restart
operation.
Temporary malfunction by
noise.
Correct if the source of
noise is specified.
Replace sensor (PSH, PSL).
Replace outdoor unit control
PCB.
2. Error detection method
Detection of anomalous pressure
(voltage) of PSH or PSL
Operation range
High pressure : 0-4.15MPa
Low pressure : 0-1.7MPa
3
.
Condition of error displayed
If anomalous sensor output
voltage (0V or lower or 3.49V
or higher) is detected for 5
seconds within 2 minutes to 2
minutes 20 seconds after the
compressor ON
4. Presumable cause
• Broken sensor harness
• Disconnection of sensor
harness connection
(connector)
• Sensor (PSH, PSL) anomaly
• Outdoor unit control PCB
anomaly
• Anomalous installation
conditions
• Insufficient air flow volume
• Excessive or insufficient
refrigerant amount
Note:
*1 1 time flash (PSL), 2 time flash (PSH)
[ ]
YES
YES
YES
YES
NO
NO
NO
NO
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