Radiation Fin Thermistor Abnormality - Daikin RMXS-L Series Service Manual

SiUS181631EA

7.23 Radiation Fin Thermistor Abnormality

P4
Error Code
Method of Error Resistance of radiation fin thermistor is detected when the compressor is not operating.
Detection
Error Decision When the resistance value of thermistor becomes a value equivalent to open or short circuited
status
Conditions
★
Supposed
Causes
Troubleshooting
Power OFF
Power ON
Refer to Thermistor Resistance/Temperature Characteristics table 2 on page 268.
Troubleshooting
Malfunction is not decided while the unit operation is continued.
P4
is displayed by pressing the inspection button.
Defective radiation fin thermistor (FINTH)
Defective main PCB (A1P)
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Is the
resistance of the
radiation fin thermistor
normal?
Disconnect the lead wires
from the compressor, and
then check the compressor
for the insulation resistance.
The
insulation
resistance is low. (not
more than 100
kΩ)
Remove and insert the
connector for the radiation
fin thermistor X111A.
Turn
ON the power
supply, and then check
whether or not the
malfunction
recurs.
NO
YES
YES
NO
NO
YES
Troubleshooting for Outdoor Unit
Replace the radiation fin
thermistor.
Replace the compressor.
Completed.
Replace the main PCB
(A1P).
(R22104)
251