Daikin D-Series User Manual

Troubleshooting for Outdoor Unit Si18-525B
386 Troubleshooting
7.20 Malfunction of Inverter Radiating Fin Temperature Rise
Sensor
Remote
Controller
Display
P4
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Resistance of radiation fin thermistor is detected when the compressor is not operating.
Malfunction
Decision
Conditions
When the resistance value of thermistor becomes a value equivalent to open or short circuited
status.

Malfunction is not decided while the unit operation is continued.
"P4" will be displayed by pressing the inspection button.
Supposed
Causes

Defect of radiator fin temperature sensor

Defect of inverter PCB
Troubleshooting
∗
Refer to thermistor resistance / temperature characteristics table on P398.
(Q0440)
After resetting, restart.
YES
YES
Is the
resistance of thermistor
correct?
Is the resetting possible?
Replace inverter PCB.
Measure the resistance of
radiation fin thermistor.
NO
Replace inverter PCB.
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.

Daikin D-Series Specifications

General

HSPF Rating	Up to 10.0
Cooling Capacity	9, 000 - 36, 000 BTU/h
Heating Capacity	9, 000 - 36, 000 BTU/h
Energy Efficiency Ratio (EER)	Up to 12.5
Sound Level	19 - 50 dB (Indoor), 49 - 60 dB (Outdoor)
Noise Level	19 - 50 dB (Indoor), 49 - 60 dB (Outdoor)
Power Supply	208/230V, 1-phase, 60Hz