Daikin FTX25JVEA9 Service Manual page 287

Troubleshooting - Outdoor Unit Related
3.3.12 Faulty Outside Air Thermistor
H9
Outdoor Unit
Indication
Method of
Malfunction
Detection
Malfunction When the outside air temperature sensor became short-circuited or open.
Decision
Conditions
"
Supposed
"
Causes
Troubleshooting
274
Faulty outside air temperature sensor
Faulty connectors connection of outside air temperature sensor
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Disconnect the thermistor
connectors from outdoor unit
PC board and measure the
resistance of suction air
temperature sensor.
Is the resistance
normal referring to the
table below?
YES
A
1 -10°C 117kΩ
2 0°C 67kΩ
3 10°C 40kΩ
4 20°C 25kΩ
5 30°C 16kΩ
6 40°C 10kΩ
7 50°C 7kΩ
8 60°C 5kΩ
9 70°C 3kΩ
NO
B
Si18-201
Replace thermistor or
thermistor assembly.
If no faulty contact is
generated, replace outdoor
unit PC board.
(MF031)
Service Diagnosis