-
138
-
'19 • SCM-SM-276
Error code
Remote control:
LED Green Red
Indoor
Outdoor
Content
E28
Remote control
temperature sensor anomaly
Keeps ashing
Stays OFF
–
Stays OFF
1. Applicable model
5. Troubleshooting
All models
Diagnosis Countermeasure
NO
YES
NO
YES
Is the remote
control temperature sensor
connected properly?
Are the
characteristics of remote
control temperature sensor OK?
Is the temperature sensor
wire OK?
Resistance-temperature characteristics of remote control temperature sensor (Thc)
0
1
2
4
6
8
10
12
Temperature (°C)
65
62
59
53
48
44
40
36
14
16
18
20
22
24
26
28
33
30
27
25
23
21
19
18
30
32
34
36
38
40
42
44
16
15
14
13
12
11
9.9
9.2
46
48
50
52
54
56
58
60
8.5
7.8
7.3
6.7
6.3
5.8
5.4
5.0
Resistance value (kΩ)
Temperature (°C)
Resistance value (kΩ)
Correct.
Defective remote control
temperature sensor
➞
Replace.
Defective remote control
PCB
➞
Replace.
(Defective remote control
temperature sensor input
circuit)
2. Error detection method
Detection of anomalously low
temperature (resistance) of
remote control temperature
sensor (Thc)
3 .
Condition of error displayed
When the temperature sensor
detects -50°C or lower for
5 seconds continuously,
the compressor stops. After
3-minute delay, the compressor
starts again automatically, but
if this error occurs again within
60 minutes after the initial
detection.
4. Presumable cause
• Faulty connection of remote
control temperature sensor
• Defective remote control
temperature sensor
• Defective remote control PCB
Note:
After 10 seconds has passed since remote control temperature sensor was switched from valid to invalid, E28 will not be displayed even if the
sensor harness is disconnected. At same time the sensor, which is effective, is switched from remote control temperature sensor to indoor return
air temperature sensor. Even though the remote control temperature sensor is set to be Effective, the return air temperature displayed on remote
control for checking still shows the value detected by indoor return air temperature sensor, not by remote control temperature sensor.
NO
YES
NO
YES
Is the remote
control temperature sensor
connected properly?
Are the
characteristics of remote
control temperature sensor OK?
Is the temperature sensor
wire OK?
Resistance-temperature characteristics of remote control temperature sensor (Thc)
0
1
2
4
6
8
10
12
Temperature (°C)
65
62
59
53
48
44
40
36
14
16
18
20
22
24
26
28
33
30
27
25
23
21
19
18
30
32
34
36
38
40
42
44
16
15
14
13
12
11
9.9
9.2
46
48
50
52
54
56
58
60
8.5
7.8
7.3
6.7
6.3
5.8
5.4
5.0
Resistance value (kΩ)
Temperature (°C)
Resistance value (kΩ)
To Next Page
Loading...
Need help?
General
