Daikin REYQ72, Serveice Manual

Page: 165 / 273

Troubleshooting by Indication on the Remote Controller SiUS39-602
154 Troubleshooting
2.23
“
H9
”
Outdoor Unit: Malfunction of Thermistor for Outdoor
Air (R1T)
Remote
Controller
Display
H9
Applicable
Models REYQ72M, 96M
Method of
Malfunction
Detection The abnormal detection is based on current detected by current sensor.
Malfunction
Decision
Conditions When the outside air temperature sensor has short circuit or open circuit.
Supposed
Causes
„
Defect of thermistor (R1T) for outdoor air
„
Defect of outdoor unit PC board (A1P)
Troubleshooting
The alarm indicator is displayed when the fan only is being used also.
∗
1: Refer to thermistor resistance / temperature characteristics table on P.239.
(V3070)
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 PC board.
(3.5k
Ω
~
360k
Ω
)
∗
1
Connector is
connected to X44A of
outdoor PC board
(A1P).
Replace outdoor unit PC board
(A1P).
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor (R1T)
YES
YES