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ESIE09-08
"C4" Indoor Unit: Malfunction of Thermistor (R3T) Liquid
3.6
Thermistor R-410A
C4
Remote Control
Display
Subcode 0
Applicable
All indoor unit models
Models
Method of
Malfunction detection is carried out by temperature detected by liquid thermistor.
Malfunction
Detection
Malfunction
When the liquid thermistor becomes disconnected or shorted while the unit is running.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P229.
Troubleshooting
Defect of thermistor (R3T) for liquid pipe
Defect of indoor unit PC board (A1P)
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
Caution
Connector
NO
is connected to X18A
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
Troubleshooting by Indication on the Remote Controller
Bad wiring connection
value < -43.6°C
Faulty thermistor
value > 115°C
Connect the thermistor and turn
on again.
Replace the thermistor (R3T).
Replace the indoor unit PC board (A1P).
(V2784)
137
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Troubleshooting
