Indoor Temperature Sensor Error (E121) - Samsung AC071MN4PKH Service Manual

Troubleshooting

4-4-2. Indoor temperature sensor error (E121)

Indoor unit display
Judgment method
Symptom
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
360 Cassette
Refer to checking method, as shown below.
If the indoor temperature sensor is open or short circuit.
4-26
x(Ice blue) x(Yellow green) x(Blue) ◑(Red)
Yes
Restart the system after connecting
to the PCB connector
Yes
Indoor temperature sensor
failure (replace)
<Temperature sensor resistance value>
Current Resistance
temperature(°C) (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