Characteristics Of Sensor Ok? - Mitsubishi KXZ Series Technical Manual

Error code
Remote control: E53
7-segment display: E53
1. Applicable model
Outdoor unit
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:
LED Green Red
Stays Off
Indoor
Outdoor
5. Troubleshooting
Diagnosis
Save data for 30 minutes before stopping in Mente PC.
Is connection
of sensor connector
OK?
YES YES
Are the
characteristics of
sensor OK?
* Check several times the temperature-resistance characteristics of
sensor a few times to find out any poor connection.
Temperature-resistance characteristics of
Suction pipe temperature sensor (Tho-S)
Temperature (°C)
264
-
Content
Suction pipe temperature sensor anomaly
(Tho-S)
NO
NO
YES
5kΩ at 25°C
-
'20 • KX-T-373
Countermeasure
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.