SiUS28-902_B
Troubleshooting by Indication on the Remote Controller
Service Diagnosis
101
3.10 Heat Exchanger (Gas Pipe) Thermistor Abnormality
Remote
Controller
Display
C5
Applicable
Models
All indoor models
Method of Error
Detection
The error is detected by temperature detected by gas pipe thermistor.
Error Decision
Conditions
When the gas pipe thermistor becomes disconnected or shorted while the unit is running
Supposed
Causes
Defective indoor unit thermistor for heat exchanger (gas pipe)
Defective indoor unit PCB
Troubleshooting
Note:
Connector and indoor unit PCB
Refer to “Thermistor Resistance / Temperature Characteristics” table on P.161.
Connector
is connected to the
connector (
*
) of the indoor
u
nit PCB.
Resistance
is normal
w
hen
meas
u
red after
disconnecting the thermistor
from the indoor
u
nit
PCB (0.6k
W
~
360k
W
)
Caution
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
the connector or parts may
b
e damaged.
Replace the indoor
u
nit PCB.
Connect the thermistor and t
u
rn
O
N
again.
N
O
N
O
Replace the thermistor (
*
).
YES
YES
Model
Connector for the heat exchanger (gas pipe) thermistor
Symbol
PCB
FCQ
X11A
R3T
A1P
FHQ
X11A
R3T
A1P
FAQ
X14A
R3T
A1P
FTQ
X17A
R2T
A1P