Thermistor System Abnormality - Daikin VRV-WIII RWEYQ72PTJU Service Manual

SiUS30-1301

3.26 Thermistor System Abnormality

J3, J4, J5, J7, J9
Error Code
Applicable
RWEYQ72P, 84P
Models
Method of Error The error is detected according to the temperature detected by each individual thermistor.
Detection
Error Decision When thermistor is disconnected or short-circuited during operation
Conditions
 Defective connection of thermistor
Supposed
 Defective thermistor
Causes
 Defective condensing unit PCB
Troubleshooting
1.Error code and thermistor
Note:
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution Caution
connectors, or parts may be damaged.
Check connectors for thermistor.
Is it normal?
YES
Remove thermistor from
condensing unit PCB, then
measure the resistance using a
tester.
Is it normal?
YES
Error
Code
J3
Discharge pipe thermistor
J4
Heat exchanger gas pipe thermistor
J5
Suction pipe thermistor
J7
Receiver outlet liquid pipe thermistor
J9
Subcooling heat exchanger outlet pipe thermistor
CHECK 11 Refer to P.250.
Troubleshooting by Indication on the Remote Controller
NO
NO
Thermistor
Connect correctly.
Replace the thermistor (*1).
Replace the condensing unit
PCB (A1P).
Connector
Electric
RWEYQ72/84PTJU9
Symbol
RWEYQ72/84PTJU
RWEYQ72/84PYDN
R3T X34A
R4T X37A
R2T X37A
R6T X37A
R5T X37A
X29A
X30A
X30A
X30A
X30A
195