Table of Contents
SiBE12-933_A
4.5
Thermistor or Related Abnormality (Indoor Unit)
C4 , C9
Remote
Controller
Display
Method of
The temperatures detected by the thermistors are used to determine thermistor errors.
Malfunction
Detection
Malfunction
When the thermistor input is more than 4.96 V or less than 0.04 V during compressor
operation ∗ .
Decision
∗
Conditions
F(A)TXS20-50G, F(C)(A)TXG25-50E, FDK(X)S25/35EA, FDK(X)S50C, FLK(X)S25-50BA,
FVXS25-50F
When above about 212°C (less than 120 Ω ) or below about –50°C (more than 1,860 k Ω ).
ATX20-35G
When above about 105°C (less than C4 : 1,070 Ω / C9 : 829 Ω ) or below about –30°C (more than C4 :
331 Ω / C9 : 88 k Ω ).
Note:
The values vary slightly in some models.
Supposed
Causes
Troubleshooting
Check No.06
Refer to P.215
C4
C9
Service Diagnosis
(reference)
Faulty connector connection
Faulty thermistor
Faulty PCB
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check the connector connection.
Is it normal?
YES
Check No. 06
Check the thermistor resistance
value.
Is it normal?
YES
: Heat exchanger temperature thermistor
: Room temperature thermistor
NO
NO
Troubleshooting
Correct the connection.
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
(R7134)
181
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