Error code
Remote control:
7-segment display: –
LED
Green
Red
Indoor
Outdoor
Content
'14 • KX-SM-221
E53/E55*1
E53/E55
Suction pipe temperature thermistor anomaly (Tho-S),
Under-dome temperature thermistor anomaly (Tho-C)
Keeps flashing
Stays OFF
Keeps flashing 1-time flash
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis
Countermeasure
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 thermistor.
(Tho-S or Tho-C)
Replace outdoor control
PCB.
2. Error detection method
Detection of anomalously low
temperature (resistance) of
Tho-S or Tho-C
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 compressor
ON, compressor stops. When
the compressor is restarted
automatically after 3-minutes
delay, if this anomaly occurs 3
times within 40 minutes.
4. Presumable cause
• Broken thermistor harness or
the internal wire of sensing
section (Check the molded
section as well)
• Disconnection of thermistor
harness connection
(connector)
• Outdoor control PCB
anomaly
Note:
*1 E53 : Tho-S, E55 : Tho-C
5kΩ at 25 (ºC)
Temperature (ºC)
Te
mpearture thermistor resistance (kΩ)
NO
NO
YES
YES
Save data for 30 minutes before stopping in Mente PC.
Is
the connector of
thermistor connected
properly ?
Are
the characteristics
of thermistor OK?
※
1
Regarding the characteristics of
the thermistor, see the following chart.
Temperature-resistance characteristics of
suction pipe temperature thermistor (Tho-S)
Temperature-resistance characteristics of
under-dome temperature thermistor (Tho-C)
※
1 Check several times to prove any poor connection.
Temperature (ºC)
Te
mpearture thermistor resistance (kΩ)
0
20
40
60
80
100
120
140
160
180
200
0
20
40
60
80 100 120 140 160
E53/E55
-
110
-
