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

SiENBE18-621
7.12 Malfunction of Thermistor (R4T) for Outdoor Unit Heat
Exchanger
J6
Remote Control
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
" Defect of thermistor (R4T) for outdoor unit heat exchanger
Supposed
" Defect of outdoor unit PCB (A1P)
Causes
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P355.
Troubleshooting
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.
(3.5kW~
360kW)
YES
NO
NO
Troubleshooting for Outdoor Unit
Connect the thermistor and turn
on again.
Replace the thermistor (R7T).
Replace outdoor unit PC board
(A1P).
(V3074)
321