Samsung ERV RHF025EE Service Manual page 109

12-4 Fault Diagnosis by Symptom
12-4-1 Temperature Sensor Error(CN41)
Error Mode
Display
Check Method Temperature sensor disconnection or dislocation
Cause Connection electrodes contact, sensor disconnection or electric leakage
Sensor SPEC.
103 AT : 25˚C 10KΩ
E121 (E221) code appears when unit operation
starts or while it is in operation.
Is temperature sensor connector (CN41)
of PCB dislocated from PCB?
Detach the temperature sensor connector
from PCB, to measure resistance between the
two electrodes.
Is measured resistance
a lot different from the value
specified by the table besides?
Restart the unit after having
replaced PCB.
Samsung Electronics
Indoor temperature sensor error (OPEN/SHORT)
Yes
Yes
Yes
Outdoor temperature sensor error (OPEN/SHORT)
No
Restart operation after link the
connector to PCB.
No
Outdoor temperature
thermistor disorder(replacement)
Temperature Resistance
(˚C) (kΩ)
70 2.2
60 3.0
50 4.2
40 5.8
30 8.3
20 12.1
10 18.0
0 27.3
-10 43.0
12-3