J6" Malfunction Of Thermistor (R4T) For Outdoor Unit Heat Exchanger - Daikin VRV III-S RXYMQ36 48PVJU Service Manual

SiUS34-907
J6
3.24 " " Malfunction of Thermistor (R4T) for Outdoor Unit Heat
Exchanger
J6
Remote
Controller
Display
Applicable
RXYMQ36 · 48PVJU
Models
Method of Malfunction is detected from the temperature detected by the heat exchanger thermistor.
Malfunction
Detection
Malfunction
When a short circuit or an open circuit in the heat exchanger thermistor is detected
Decision
Conditions
 Defect of thermistor (R4T) for outdoor unit coil
Supposed
 Defect of outdoor unit PCB (A1P)
Causes
 Defect of thermistor connection
Troubleshooting
Be sure to turn off the power switch before connecting or disconnecting the connector, or parts may be damaged.
Caution
Confirm which thermistor is abnormal
using outdoor unit "monitor mode".
(Refer to P.105, 106)
connected to X12A of outdoor
unit PCB (A1P).
measured after disconnecting
the thermistor R4T from the
indoor unit PCB.
∗ Refer to "Thermistor Resistance / Temperature Characteristics" table on P.241.
Troubleshooting
Connector is
NO
YES
Resistance
is normal when
NO
(3.5kW to
360kW)
YES
Troubleshooting by Indication on the Remote Controller
Connect the connector and turn
on again.
Replace the thermistor (R4T).
Replace the outdoor unit PCB
(A1P).
149