Mitsubishi FDT125VNPWVH - Page 81

Error code
Remote control:
LED Green Red
Indoor
Content
E28
Remote control
temperature sensor anomaly
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 temperature sensor 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 connector.
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 invalid to valid, E28 will not be displayed even if the temperature
sensor harness is disconnected. At same time the temperature sensor, which is eective, is switched from remote control temperature sensor to indoor return
air temperature sensor. Even though the remote control temperature sensor is set to be eective, 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?
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)
'22 • PAC-SM-412
-
80
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