Troubleshooting
4-56
Samsung Electronics
4-4. Troubleshooting by symptoms
Yes
No
No
In this case, is the resistance
value out of range in the temperature
table on the right?
Yes
Is indoor temperature
sensor disconnected from the
connector in PCB?
Restart the system
after replacing the PCB.
Restart the system after connecting
to the PCB connector
Indoor temperature sensor
failure (replace)
Remove the indoor temperature sensor
connector from the PCB and measure the
resistance between two terminals
Current
temperature
(°C)
Resistance
(kΩ)
40
5.800
35
6.900
30
8.300
25
10.00
20
12.10
15
14.70
10
18.00
5
22.00
0
28.30
-5
33.90
-10
42.30
<Temperature sensor resistance value>
4-4-1. Indoor temperature sensor error (E121)
Display
Outdoor Unit display
E121
Wired remote Control, Wind Free RAC
E121
Duct, 1way Cassette
4way Cassette,
4way Cassette(600x600)
MAX4
Console
360 Cassette
or
or
or
Red
◑
Duct
Blue
Red
1way
Blue Yellow
X
X
◑
X
X
X
◑
X
X
X
◑
X
X
X
◑
X
X
Judgment
method
Refer to checking method, as shown below.
Symtom
If the indoor temperature sensor is open or short circuit.