Daikin FTX25JVEA9 Service Manual page 311

Troubleshooting - Outdoor Unit Related
3.3.33 Faulty BOX Thermistor Malfunction
P3
Outdoor Unit
Indication
Method of Malfunction of BOX temperature thermistor is detected using the temperature detected by the
thermistor.
Malfunction
Detection
Malfunction When the detected temperature came to 92°C or higher, or to -30°C or lower
Decision
"
Conditions
"
Supposed
Causes
Troubleshooting
298
When BOX thermistor malfunction is detected once, the system shuts down.
(The 1-time counter automatically resets itself when cause of malfunction is resolved.)
Faulty main unit PC board
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Start
P3 displayed
Turn the power supply off
once and then back on.
Is P3 displayed again?
NO
YES
Si18-201
Replace main unit PC
board.
Reset normally.
Could be outside causes
other than parts defect.
(MF053)
Service Diagnosis