Troubleshooting by Indication on the Remote Controller ESIE09-08A
152 Troubleshooting
3.9 “C9 ” Indoor Unit: Return Water Thermistor (R4T)
Remote Control
Display
C9
Subcode 0
Applicable Models AII indoor unit models
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by return water temperature thermistor.
Malfunction
Decision Conditions
When the return water temperature thermistor becomes disconnected or shorted while the unit is running.
Supposed Causes Defect of indoor unit thermistor (R4T) for water return
Defect of indoor unit PC board (A1P)
Troubleshooting
Refer to thermistor resistance / temperature characteristics table on P251.
Caution
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
Replace the indoor unit PC board (A1P).
Connect the thermistor and turn
on again.
Faulty thermistor
value > 95 C
NO
NO
Replace the thermistor (R4T).
YES
YES
Connector is
connected to X12A of
the indoor unit PC
board.
Resistance
is normal when
measured after
disconnecting the thermistor
(X12A) (R4T) from the
indoor unit PC board.
(7.2k
~112k )
(V2786)
Bad wire connection
value < -43.6 C
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