C4" Indoor Unit: Malfunction Of Thermistor (R3T) Liquid Thermistor R-410A - Daikin ALTHERMA HT Service Manual

Troubleshooting by Indication on the Remote Controller
"C4" Indoor Unit: Malfunction of Thermistor (R3T) Liquid
3.7
Thermistor R-410A
C4
Remote Control
Display
Subcode 0
All indoor unit models
Applicable
Models
Malfunction detection is carried out by temperature detected by liquid thermistor.
Method of
Malfunction
Detection
When the liquid thermistor becomes disconnected or shorted while the unit is running.
Malfunction
Decision
Conditions
 Defect of thermistor (R3T) for liquid pipe
Supposed
 Defect of indoor unit PC board (A1P)
Causes
Troubleshooting
 Refer to thermistor resistance / temperature characteristics table on P239.
140
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
Caution
Connector
is connected to X18A NO
of the indoor unit PC board
(A1P).
YES
Resistance
is normal when
measured after
NO
disconnecting the thermistor
(R3T) from the indoor unit PC
board
(0.5k ~360k )
YES
Bad wiring connection
value < -43.6°C
Faulty thermistor
value > 115°C
ESIE09-08B
Connect the thermistor and turn
on again.
Replace the thermistor (R3T).
Replace the indoor unit PC board (A1P).
(V2784)
Troubleshooting