Mitsubishi Heavy Industries SCM50ZS-W User Manual

-
135
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'19 • SCM-SM-281
Error code
Remote control:
LED Green Red
Indoor
Content
E28
Remote control
temperature sensor anomaly
Indoor Keeps ashing 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 thermistor wire
OK?
Temperature-resistance 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 thermistor wire
OK?
Temperature-resistance 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)

Mitsubishi Heavy Industries SCM50ZS-W Specifications

General

Brand	Mitsubishi Heavy Industries
Model	SCM50ZS-W
Category	Air Conditioner
Language	English