Detach the connector (CN4) from the room
temperature thermistor and heat exchanger
thermistor and measure the thermistor resistances.
Did the resistances almost agree with those indicated
in the right-hand figure?
The product will begin detecting failures if it is
close to a wire break or short-circuit.
0 1020304050
10
20
30
40
䋨㷄䋩
䋨
k
㱅䋩
0
Are the room temperature thermistor, heat exchanger
thermistor connector (CN4)
[Situation] The timer lamp blinks 9 times and the product will not run.
[Estimated failure location]
䊶
Loose connector, wire break, or short-circuit in the room temperature
thermistor, heat exchanger thermistor.
[Cautions]
䊶
Starting the product by remote control will initiate failure detection.
(Merely turning on the power will not activate the failure detection function.)
[Diagnosis flow]
Initiating troubleshooting
Ye s
Ye s
No
No
Correct the connectors.
Replace the room temperature and
heat exchange thermistor.
Replace the "indoor control P.W.B".
Thermistor characteristics (resistance)
Thermistor resistance
Thermistor temperature
securely inserted?
9. Timer lamp blinking: blinking 9 times
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