Troubleshooting by Indication on the Remote Controller SiUS34-907
146 Troubleshooting
3.21 “H9” Malfunction of Thermistor (R1T) for Outdoor Air
Remote
Controller
Display
H9
Applicable
Models
RXYMQ36 · 48PVJU
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the outdoor air thermistor.
Malfunction
Decision
Conditions
When the outside air temperature thermistor has short circuit or open circuit in operation
Supposed
Causes
Defective thermistor connection
Defect of thermistor (R1T) for outdoor air
Defect of outdoor unit PCB (A1P)
Troubleshooting
∗ Refer to “Thermistor Resistance / Temperature Characteristics” table on P.241.
Replace the thermistor (R1T).
Resistance
is normal when
measured after disconnecting
the thermistor (R1T) from
the outdoor unit PCB.
(3.5kW to
360kW)
Connector is
connected to X11A of outdoor
PCB (A1P).
Replace the outdoor unit PCB
(A1P).
NO
Connect the connector and turn
on again.
NO
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting the connector, or parts may be damaged.
Confirm which thermistor is abnormal
using outdoor unit " monitor mode".
(Refer to P.105, 106)
YES
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