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4-4-3. Indoor heat exchanger temperature sensor error (E122)
Indoor unit display
Judgment method
Symptom
Is the indoor heat exchanger
temperature sensor connector disconnected
from the PCB?
No
Remove the indoor heat exchanger
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 short or open circuit of indoor heat exchanger temperature sensor.
x(Ice blue) ◑(Yellow green) x(Blue) ◑(Red)
Yes
Restart the system after
connecting the connector to PCB
Yes
Failure of the indoor heat
exchanger temperature sensor
(replace)
4-27
Troubleshooting
<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
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