Reactor Surface Thermistor Abnormality - Daikin Aurora Series Service Manual

Troubleshooting by Error Code

2.53 Reactor Surface Thermistor Abnormality

P3
Error Code
Applicable
RXLQ72TATJU
Models
Method of Error
Detect according to the value detected with the reactor surface thermistors.
Detection
Error Decision When the system is in operation and the thermistor disconnection or short circuit is detected.
Conditions
Supposed
Causes
Troubleshooting
249
Defective connection of thermistor
Defective reactor surface thermistor(s)
Defective inverter PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Are the
thermistors
(R71T, R72T) correctly
attached to the
PCB ?
YES
Disconnect the thermistors
from the inverter PCB (A3P),
and check the resistance.
Are the
resistance of the
thermistors
normal?
YES
Turn ON
the power supply,
and check if the P3 error
recurs when
operation
starts.
NO
NO
NO
YES
SiUS341802E
Correct the connection.
Replace the defective
thermistor(s).
Replace the inverter PCB
(A3P).
Continue operation.
Service Diagnosis