Appropriate Measures For Different Symptoms; Fan Coil Unit Room Sensor Error (Open/Short) - Samsung AG026MN1DEH/EU Service Manual

4-3. Appropriate Measures for Different Symptoms

4-3-1. Fan coil unit ROOM sensor error (OPEN/SHORT)

Error number
Duct, cassette (1‑Way/2‑Way/
Mini 4‑Way)
Fan coil unit 1‑Way
display
Yellow
blue
green
2‑Way
Green Red
× ×
Criteria ∙ Refer to the judgment method below
Cause of
∙ Faulty OPEN/SHORT of number xxx fan coil unit indoor temperature sensor
problem
1. How to check
Did the indoor room temperature sensor
break away from the PCB?
After separating the indoor room temperature sensor
connector from the PCB, measure the resistance value
between the two terminals.
Did the resistance value significantly
stray from the following temperature table?
Restart operation after replacing the PCB.
4‑Way cassette type
r u n /
Defrost
stop
or or
◑ × × × ◑
connector
Yes
EX) ROOM TEMPERATURE 26℃
‑ RESISTANCE 09.26KΩ
Yes
Wall mount type
LED Indication
Clean
Timer
Filter
18°C 21°C Timer
× × × × ◑
No
Restart operation after connecting the
connector to the PCB.
No
Replace indoor room temperature sensor
as it is defective.
4-20
Trouble shooting
Circular cassette type
Ice Yellow
24°C 27°C Blue
Blue Green
× × × × ×
Temp. (°C) Resistance (KΩ)
70
60
50
40
30
20
10
0
‑10
Red
◑
2.2
3.0
4.2
5.8
8.3
12.1
18.0
27.3
43.0