Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
97 Troubleshooting
3.10 “C5” Indoor Unit: Malfunction of Thermistor (R3T) for
Gas Pipes
Remote
Controller
Display
C5
Applicable
Models
All indoor unit models
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by gas pipe thermistor.
Malfunction
Decision
Conditions
When the gas pipe thermistor becomes disconnected or shorted while the unit is running.
Supposed
Causes
 Defect of indoor unit thermistor (R3T) for gas pipe
 Defect of indoor unit P.C.B.
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P.166.
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Replace the indoor unit P.C.B.
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor (R3T).
YES
YES
Connector is
connected to X11A of
the indoor unit
P. C . B .
Resistance
is normal when
measured after
disconnecting the thermistor
(R3T) from the indoor
unit P.C.B.
(0.6kΩ~
360kΩ)