Troubleshooting By Symptoms; Indoor Temperature Sensor Error (E121) - Samsung AC009BNLDCH Service Manual

Troubleshooting

4-4. Troubleshooting by symptoms

4-4-1. Indoor temperature sensor error (E121)

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