C5" Indoor Unit: Malfunction Of Tank Thermistor (R2T) - Daikin ALTHERMA HT ERSQ 011 AA Service Manual

ESIE09-08A
"C5 " Indoor Unit: Malfunction of Tank Thermistor (R2T)
3.8
C5
Remote Control
Display
Subcode 0
Applicable Models All indoor unit models
Method of
Malfunction detection is carried out by temperature detected by tank thermistor.
Malfunction
Detection
Malfunction When the tank thermistor becomes disconnected or shorted while the unit is running.
Decision Conditions
 Defect of indoor unit tank thermistor (R2T)
Supposed Causes
 Defect of indoor unit PC board (A3P)
Troubleshooting
 Refer to thermistor resistance / temperature characteristics table on P251.
Troubleshooting
Be sure to turn off power switch before connecting or disconnecting connector,
Caution
otherwise parts may be damaged.
Check if
NO
DHW option is
turned rightful active
[6-00].
YES
Connector
is connected to
NO
X11A of the indoor unit
PC board A3P.
YES
Resistance
is normal
when measured after
NO
disconnecting the thermistor
(R2T) from the indoor
unit PC board.
(1.6k ~360k )
YES
Troubleshooting by Indication on the Remote Controller
Make setting, restart unit.
Bad wire connection
Connect the thermistor and turn
value < -35.7˚C
on again.
Faulty thermistor
Replace the thermistor (R2T).
value > 90˚C
Replace the indoor unit PC board (A3P).
(V2785)
151