ESIE09-08 Troubleshooting by Indication on the Remote Controller
Troubleshooting 137
3.6 “C4” Indoor Unit: Malfunction of Thermistor (R3T) Liquid
Thermistor R-410A
Remote Control
Display
C4
Subcode 0
Applicable
Models
All indoor unit models
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by liquid thermistor.
Malfunction
Decision
Conditions
When the liquid thermistor becomes disconnected or shorted while the unit is running.
Supposed
Causes
Defect of thermistor (R3T) for liquid pipe
Defect of indoor unit PC board (A1P)
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P229.
(V2784)
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.
Bad wiring connection
value < -43.6°C
Faulty thermistor
value > 115°C
NO
NO
Replace the thermistor (R3T).
YES
YES
Connector
is connected to X18A
of the indoor unit PC board
(A1P).
Resistance
is normal when
measured after
disconnecting the thermistor
(R3T) from the indoor unit PC
board
(0.5k
~360k )
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