H9" Outdoor Unit: Malfunction Of Thermistor For Outdoor Air (R1T) - Daikin R-410A Service Manual

SiBE39-402A
4.21 "H9" Outdoor Unit: Malfunction of Thermistor for Outdoor
Air (R1T)
H9
Remote
Controller
Display
Applicable
AII outdoor unit models
Models
Method of The abnormal detection is based on current detected by current sensor.
Malfunction
Detection
Malfunction
When the outside air temperature sensor has short circuit or open circuit.
Decision
Conditions
! Defect of thermistor (R1T) for outdoor air
Supposed
! Defect of outdoor unit PC board (A1P)
Causes
Troubleshooting
The alarm indicator is displayed when the fan only is being used also.
∗ Refer to thermistor resistance / temperature characteristics table on P198.
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Connector is
connected to outdoor
PC board(A1P).
YES
Resistance
is normal when
measured after
disconnecting the thermistor
(R1T) from the outdoor
unit PC board.
(3.5kΩ~
360kΩ)
YES
Troubleshooting by Indication on the Remote Controller
NO
NO
Connect the thermistor and turn
on again.
Replace the thermistor (R1T)
Replace outdoor unit PC board
A1P.
(V3070)
135