Thermistor System Abnormality - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

Troubleshooting by Remote Controller

2.15 Thermistor System Abnormality

H9, J3, J5, J6, J7, J8, J9
Remote
Controller
Display
Applicable RQYQ-PY1B
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
Supposed
Causes
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Check connectors for connection.
Remove thermistor from outdoor unit
PCB, then measure the resistance
using a tester.
Error code
H9
Outdoor air thermistor
J3
Discharge pipe thermistor
J5
Suction pipe thermistor
J6
Heat exchanger deicer thermistor
J7
Liquid pipe thermistor
Receiver gas vet outlet thermistor
J8
Receiver liquid level thermistor
Refrigerant regulator liquid pipe thermistor
J9
Subcooling heat exchanger outlet thermistor
126
Defective thermistor
Defective connection of connector
Defective outdoor unit PCB (service monitor PCB)
NO
Normal?
YES
NO
Normal?
YES
Defective thermistor
Connect correctly.
Replace the thermistor.
Replace the outdoor unit service
monitor PCB (A1P).
RQYQ8PY1B RQYQ10 • 12PY1B RQYQ14 • 16PY1B
Symbol Connector Symbol Connector Symbol Connector
R1T X18A R1T
R3T X29A R31T
— — R32T
— — —
R8T X11A R8T
R9T X12A R9T
R6T X30A R6T
R7T X30A R7T
R2T X30A R2T
R4T X30A R4T
R5T X30A R5T
SiBE341027
X18A R1T X18A
R31T
X29A
R32T X29A
— R33T
X11A R8T X11A
X12A R9T X12A
X30A R6T X30A
X30A R7T X30A
X30A R2T X30A
X30A R4T X30A
X30A R5T X30A
Service Diagnosis