Radiation Fin Thermistor Abnormality - Daikin SkyAir RZR-TA Series Service Manual

SiUS281811E

4.46 Radiation Fin Thermistor Abnormality

P4
Error Code
Applicable
All outdoor units
Models
Method of Error Resistance of the following thermistor is detected when the compressor is not operating.
Detection (1) Radiation fin thermistor
(2) PCB circuit thermistor
Error Decision
When the resistance value of thermistor becomes a value equivalent to open circuited or short
Conditions circuited status
Error is not decided while the unit operation is continued.
P4 will be displayed by pressing the inspection button.
Supposed  Defective radiation fin temperature thermistor
Causes  Defective PCB
 Defective inverter compressor
 Defective fan motor
Troubleshooting
Reference
CHECK 11 Refer to page 270.
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Measure resistance value of
the radiation fin thermistor.
CHECK 11
* Disconnect the connector (X111A) from the radiation
fin thermistor, and then check the thermistor.
Is the thermistor
resistance value normal?
YES
The
compressor's insulation
resistance is less than
100 k:.
NO
The fan motor's
insulation resistance is less
than 1 M:.
NO
Does the error
recur when the
power supply turns
ON?
NO
Troubleshooting by Error Codes
NO
YES
YES
YES
Replace the outdoor
main PCB (A1P).
Replace the
compressor (M1C).
Replace the fan motor.
Replace the outdoor
main PCB (A1P).
Continue the operation.
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