Malfunction Of Thermistor (R4T) For Outdoor Unit Heat Exchanger - Daikin E-Series Service Manual

SiAU18-715
7.12 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
∗
Troubleshooting
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
PC board (A1P).
YES
Resistance
is normal when
measured after
disconnecting the thermistor
(R7T) from the outdoor
unit PC board.
(3.5kΩ~
360kΩ)
YES
Refer to thermistor resistance / temperature characteristics table on P405.
NO
NO
Troubleshooting for Outdoor Unit
Connect the thermistor
and turn on again.
Replace the thermistor
(R7T).
Replace outdoor unit PC
board (A1P).
(Q0561)
371