Malfunction Of Thermistor (R4T) For Outdoor Unit Heat Exchanger - Daikin Super Multi Plus D-Series Service Manual

Troubleshooting for Outdoor Unit
7.11 Malfunction of Thermistor (R4T) for Outdoor Unit Heat
Exchanger
J6
Remote
Controller
Display
Applicable
AII outdoor unit models
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 exchange thermistor is detected.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P326.
304
Defect of thermistor (R4T) for outdoor unit heat exchanger
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.
Connector
is connected to outdoor
unit PCB
(A1P).
YES
Resistance
is normal when
measured after
disconnecting the thermistor
R4T from the outdoor
unit PCB.
(3.5kΩ~
360kΩ)
YES
NO
NO
SiEBE18-526
Connect the thermistor and turn
on again.
Replace the thermistor R4T.
Replace outdoor unit PCB A1P.
(Q0431)
Troubleshooting