Mitsubishi KXZ Series - Page 253

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251
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'20 • KX-T-373
E36
E36
Discharge pipe temperature
error (Tho-D1)
Stays Off
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
Is the unit
installation environment
within the range of
limitation?
Are the
refrigerant amount and
piping length
OK?
Is the
discharge pipe
temperature sensor
normal?
Save data for 30 minutes before stopping in Mente PC.
NO
NO
Is the
sensor connector
inserted to the PCB connector
properly?
NO
NO
Does it
recur after restarting
operation?
Reset the power and restart operation.
NO
YES
Check and save the data of
operating condition.
Check the ROM version.
Propose an improvement to
the customer.
Adjust the refrigerant
amount poperly.
(Check whether the
refrigerant amount is
(Check the gas leakage.)
Insert connectors securely.
Check if characteristics
are correct, referring to
the characteristics list
of E39. And if necessary,
replace the discharge pipe
temperature sensor.
Check it, as much as
possible, under the
operating conditions for
30 minutes before error
occurred.
Wait and see.
Continue to obtain data, if
possible.
(Keep connecting the
Mente PC.)
Check refrigerant amount
again.
2. Error detection method
Detection of anomalously high
temperature by the discharge
pipe temperature sensor
3 . Condition of error displayed
When the discharge pipe
temperature sensor detects
115°C or higher the compressor
stops. After 3-minute delay,
the compressor starts again
automatically, but if this
anomaly occurs 5 times within
60 minutes after the initial
detection.
4. Presumable cause
• Defective discharge pipe
temperature sensor
• Defective outdoor unit control
PCB
• Insufficient amount of
refrigerant
• Insufficient air flow volume
• Short-circuit
Note:
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
YES
YES
YES
YES
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
*1 One time flash (Tho-R), 5 time flash (Tho-SC), 6 time flash (Tho-H)
E37
E37
Outdoor unit heat exchanger
temperature sensor (Tho-R) and subcooling coil
temperature sensor (Tho-SC,-H) anomaly
Keeps flashing Stays Off
Keeps flashing *1
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
Is the
connector of
sensor connected
properly?
Are the
characteristics of
sensor OK?*2
*2
Check several times to prove any poor connection.
Outdoor heat exchanger temperature sensor (Tho-R)
Sub-cooling coil sensor (Tho-SC, Tho-H)
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 conditions.
Check the conditions whether
it occurs immediately after the
power on or during operation
or stopping.
Check the sensed value.
Compare the temperature
on Mente PC with actual
measured value.
Insert the connector
securely.
Replace sensor .
(Tho-SC, Tho-H, Tho-R)
Replace outdoor unit control
PCB.
2. Error detection method
Detection of anomalously low
temperature (resistance)
of Tho-R or Tho-SC or Tho-H
3 . Condition of error displayed
• If -50°C or lower is detected for 5
seconds continuously within 2 minutes to
2 minutes 20 seconds after the compressor
ON, the compressor stops. And after
3 minutes delay, the compressor starts
again automatically, but if this anomalous
temperature is detected 3 times within 40
minutes after the initial detection.
• If -50°C or lower is detected for 5 seconds
continuously within 20 seconds after power ON
4. Presumable cause
• Broken sensor harness or
the internal wire of sensing
section (Check the molded
section as well)
• Disconnection of sensor
harness connection
(connector)
• Outdoor unit control PCB
anomaly
Note:
YES