Daikin REYQ8-48PY1B, Service Manual

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Troubleshooting by Indication on the Remote Controller SiBE37-701_B
305 Troubleshooting
3.27
“
H9
”
Outdoor Unit: Malfunction of Thermistor (R1T) for
Outdoor Air
Remote
Controller
Display
H9
Applicable
Models REYQ8P~48P
Method of
Malfunction
Detection Malfunction is detected from the temperature detected by the outdoor air thermistor.
Malfunction
Decision
Conditions When the outdoor air temperature thermistor has short circuit or open circuit.
Supposed
Causes
„
Defective thermistor connection
„
Defect of outdoor air thermistor (R1T)
„
Defect of outdoor unit PCB (A1P)
Troubleshooting
∗
Refer to “Thermistor Resistance / Temperature Characteristics” table on P450.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Connector is
connected to X18A
of outdoor PCB
(A1P).
NO
Connect the connector and turn on
again.
Confirm which thermistor is
abnormal using outdoor unit
"monitor mode".
(Refer to P.255~P.256)
Resistance is normal
when measured after
disconnecting the
thermistor (R1T) from
the outdoor unit PCB.
(1.8k
Ω
to 800k
Ω
)
YES
NO
YES
Replace the thermistor (R1T)
Replace the outdoor unit PCB
(A1P).