C9" Indoor Unit: Return Water Thermistor (R4T) - Daikin ERSQ 011AAV1 Service Manual

ESIE09-08
"C9 " Indoor Unit: Return Water Thermistor (R4T)
3.8
C9
Remote Control
Display
Subcode 0
Applicable
AII indoor unit models
Models
Method of Malfunction detection is carried out by temperature detected by return water temperature
Malfunction thermistor.
Detection
Malfunction
When the return water temperature thermistor becomes disconnected or shorted while the unit
Decision is running.
Conditions
Supposed
Causes
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P229.
Troubleshooting
Defect of indoor unit thermistor (R4T) for water return
Defect of indoor unit PC board (A1P)
Be sure to turn off power switch before connecting or disconnecting connector,
Caution
otherwise parts may be damaged.
Connector is
NO
connected to X12A of
the indoor unit PC
board.
YES
Resistance
is normal when
measured after
NO
disconnecting the thermistor
(X12A) (R4T) from the
indoor unit PC board.
(7.2k ~112k )
YES
Troubleshooting by Indication on the Remote Controller
Bad wire connection
Connect the thermistor and turn
value < -43.6 C
on again.
Faulty thermistor
value > 95 C
Replace the thermistor (R4T).
Replace the indoor unit PC board (A1P).
(V2786)
139