Ca" Indoor Unit: Leaving Water Thermistor Error (R5T) - Daikin ALTHERMA HT ERSQ 011 AA Service Manual

ESIE09-08A
3.10 "CA " Indoor Unit: Leaving Water Thermistor Error (R5T)
CA
Remote Control
Display
Subcode 0
Applicable Models AII indoor unit models
Method of
Malfunction detection is carried out by temperature detected by leaving water temperature thermistor.
Malfunction
Detection
Malfunction When the leaving water temperature thermistor becomes disconnected or shorted while the unit is
Decision Conditions running.
 Defect of indoor unit thermistor for leaving water (R5T)
Supposed Causes
 Defect of indoor unit PC board (A1P)
Troubleshooting
 Refer to thermistor resistance / temperature characteristics table on P251.
Troubleshooting
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
Caution
Connector
NO
(X17A) is connected to
the indoor unit PC
board.
YES
Resistance
is normal when
measured after
NO
disconnecting the thermistor
(X17A) from the indoor unit
PC board.
(7.2k ~112k )
YES
Troubleshooting by Indication on the Remote Controller
Bad wire connection
value < -43.6 C
Faulty thermistor
value > 95 C
Connect the thermistor and turn
on again.
Replace the thermistor (R5T).
Replace the indoor unit PC board (A1P).
(V2786)
153