Error code
Remote control:
LED Green Red
Indoor
Outdoor
Content
E28
7-segment display:
Remote control
temperature sensor anomaly (Thc)
Keeps ashing
Stays OFF
Keeps ashing
Stays OFF
1. Applicable model
5. Troubleshooting
All models
Diagnosis Countermeasure
YES
Is
the connector of
temperature sensor connected
properly ?
Are
the characteristics
of temperature sensor OK?
Is the temperature sensor
wire OK ? *1
NO
NO
YES
*1 Check several times to prove any poor connection.
Temperature-resistance characteristics of
remote control temperature sensor (Thc).
Regarding the characteristics of the temperature sensor,
see the following table.
Insert the connector
securely.
Replace temperature sensor
(Thc).
Replace indoor unit PCB.
2. Error detection method
Detection of anomalously low
temperature (resistance)
of Thc.
3
.
Condition of error displayed
• If -50ºC or lower is detected
for 5 seconds continuously,
compressor stops. After
3-minute delay, the
compressor is restarted
automatically, but if this
anomaly occurs again within
60 minutes after the initial
detection.
4. Presumable cause
• Anomalous connection of
remote control temperature
sensor
• Remote control temperature
sensor anomaly
• Remote control PCB anomaly
Note:
After 10 seconds has elapsed since remote control temperature sensor was switched from invalid to valid, E28 will not be displayed even
if the temperature sensor harness is disconnected or broken. However, in such case, the indoor return air temperature sensor (Thi-A) will
be valid instantly instead of the remote control temperature sensor (Thc).
Please note that even though the remote control temperature sensor (Thc) is valid, the displayed return air temperature on the remote
control LCD shows the value detected by the indoor return air temperature sensor (Thi-A), not by the remote control temperature sensor
(Thc).
Temperature (°C)
Resistance (kΩ)
Temperature (°C)
Resistance (kΩ)
Temperature (°C)
Resistance (kΩ)
Temperature (°C)
Resistance (kΩ)
0 65 14 33 30 16 46 8.5
1 62 16 30 32 15 48 7.8
2 59 18 27 34 14 50 7.3
4 53 20 25 36 13 52 6.7
6 48 22 23 38 12 54 6.3
8 44 24 21 40 11 56 5.8
10 40 26 19 42 9.9 58 5.4
12 36 28 18 44 9.2 60 5.0
–
93
–
‘20 • KX-T-373
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
E30
E30
EEVKIT False connection detection
Keeps flashing
Stays Off
Keeps flashing
1 time flash
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
YES
NO
YES
NO
2. Error detection method
3
.
Condition of error displayed
4. Presumable cause
Note: For EEVKIT, refer to 19-KX-T-335
When an unspecified indoor unit
is connected.
・When the outdoor unit is set to
the EEVKIT multi-setting
invalid and one of the indoor
unit is the EEVKIT-slave unit
in multiple refrigeration system.
・When the outdoor unit is set to
the EEVKIT multi-setting
valid and one of the indoor unit
is not the EEVKIT-slave unit
in multiple refrigeration system.
・Incorrect combination of indoor
units
・Improper setting of EEVKIT
multi-setting for outdoor unit
Reset the power source.
E30 is displayed.
Is the outdoor
unit set to the EEVKIT
multi-setting valid?
Are all indoor units
the EEVKIT-slave unit in
multiple refrigeration
system?
Are all indoor units
other than EEVKIT-slave unit
in multiple refrigeration
system?
After thoroughly checking of
indoor/outdoor unit addresses
and model settings,
reset the power source and check again.
YES
YES
NO
YES
Ensure that all indoor units
are other than EEVKIT-
slave unit in multiple
refrigeration system.
Ensure that all indoor units
are EEVKIT-slave unit
in multiple refrigeration
system.
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