Daikin D-Series User Manual

Si18-525B Troubleshooting for Outdoor Unit
Troubleshooting 373
7.8 Malfunction of Thermistor for Outdoor Air (R1T)
Remote
Controller
Display
H9
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
The abnormal detection is based on current detected by current sensor.
Malfunction
Decision
Conditions
When the outdoor air temperature sensor has short circuit or open circuit.
Supposed
Causes

Defect of thermistor (R1T) for outdoor air

Defect of outdoor unit PCB (A1P)
Troubleshooting
The alarm indicator is displayed when the fan only is being used also.
∗
Refer to thermistor resistance / temperature characteristics table on P398.
(Q0428)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Resistance
is normal when
measured after
disconnecting the thermistor
(R1T) from the outdoor
unit PCB.
(3.5kΩ~
360kΩ)
Connector is
connected to outdoor
PCB(A1P).
Replace outdoor unit PCB A1P.
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor (R1T)
YES
YES

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