H9 " Outdoor Unit: Malfunction Of Thermistor (R1T) For Outdoor Air - Daikin RQYQ140-180PY1 Service Manual

Troubleshooting by Remote Controller
H9
2.17 " " Outdoor Unit: Malfunction of Thermistor (R1T) for
Outdoor Air
H9
Remote
Controller
Display
Applicable RQYQ-PY1
RQEQ-PY1
Models
Method of Malfunction is detected from the temperature detected by the outdoor air thermistor.
Malfunction
Detection
Malfunction When the outdoor air temperature thermistor has short circuit or open circuit.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗
131
Defective outdoor air thermistor connection
Defect of outdoor air thermistor (R1T) for outdoor air
Defect of outdoor unit PCB (A1P)
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check the connection of
connector to X18A of outdoor
PCB (A1P).
Is it normal?
YES
Remove the connector for the
thermistor (R1T) from the
outdoor PCB (A1P) and
measure the resistance with a
tester.
Resistance is normal?
YES
Refer to "Thermistor Resistance / Temperature Characteristics" table on P199.
NO
NO
SiBE341001
Connect the connector correctly.
Replace the outdoor air thermistor
(R1T).
Replace the outdoor unit PCB
(A1P).
Troubleshooting