Outdoor Heat Exchanger Thermistor (R4T) Abnormality - Daikin RMXS-L Series Service Manual

Troubleshooting for Outdoor Unit

7.12 Outdoor Heat Exchanger Thermistor (R4T) Abnormality

J6
Error Code
Method of Error The temperature detected by the outdoor heat exchanger thermistor determines the error.
Detection
Error Decision When a short circuit or an open circuit in the outdoor heat exchanger thermistor is detected
Conditions
Supposed
Causes
Troubleshooting
Refer to Thermistor Resistance/Temperature Characteristics table 1 on page 267.
240
Disconnection of thermistor
Defective outdoor heat exchanger thermistor (R4T)
Defective main PCB (A1P)
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is the thermistor
NO
ASSY connected to
X12A on the main
PCB (A1P).
YES
Is the
resistance
normal when
NO
measured after
disconnecting the
thermistor (R4T)?
(3.5 kΩ~ 360 kΩ)
YES
SiUS181631EA
Connect the thermistor and
turn on again.
Replace the outdoor heat
exchanger thermistor
(R4T).
Replace the main PCB
(A1P).
(R13028)
Troubleshooting