Power Transitor Temperature Thermistor Anomaly (Tho-P1, Tho-P2) - Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual

Error code
Remote controller: E56
7-segment display: E56-1, 2 *1
*1 E56-1/1 time flash:Tho-P1 anomaly, E56-2/2 times flash: Tho-P2 anomaly
1. Applicable model
KXE6 multi outdoor unit
2. Error detection method
Detection of anomalously low
temperature (resistance) of
power transistor temperature
sensor
3. Condition of error displayed
If -10°C or lower is detected for
5 seconds within 10-minutes
to 10-minutes 20-seconds after
the compressor ON and if this
anomaly occurs 3 times within
40 minutes after the initial
detection.
4. Presumable cause
• Disconnection of the
thermistor harness or the
internal wire of sensing part
(Check the molded part)
• Disconnection of the
thermistor connector
• Defective outdoor control
PCB
Note:
LED Green Red
Keeps flashing Stays Off
Indoor
Keeps flashing Stays Off*1
Outdoor
5. Troubleshooting
Diagnosis
Save data for 30 minutes before stopping in Mente PC
Is
connection of
thermistor connector
OK?
YES
Are the
characteristics of
thermistor OK?
* Check several times the temperature-resistance characteristics
of thermistor to find out any poor connection.
Temperature-resistance characteristics of
power transistor temperature thermistor
Temperature [T](°C)
361
–
Content
Power transitor temperature
thermistor anomaly (Tho-P1, Tho-P2)
NO
NO
YES
–
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 sensor value as
well.
Insert the connector firmly
Replace power transistor
temperature thermistor
(Tho-P1, P2).
Replace outdoor control
PCB.