Thermistor Abnormality - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

Troubleshooting by Error Code

4.27 Thermistor Abnormality

H9, J3, J5, J6, J7, J9
Error Code
Applicable
All outdoor units
Models
Method of Error Error is detected from the temperature detected by the thermistor∗1.
Detection
Error Decision When the thermistor has short circuit or open circuit
Conditions
Supposed
Causes
Troubleshooting
CHECK 11
∗1
Note:
179
Defective thermistor
Defective outdoor main PCB
Defective thermistor connection
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Connector is
connected to outdoor
unit PCB.
YES
Resistance
is normal when
measured after
disconnecting the thermistor
from the outdoor main
PCB. CHECK 11
YES
Refer to page 231.
Error
Thermistor
code
H9 Outdoor air thermistor
J3 Discharge pipe thermistor
J5 Suction pipe thermistor
J6 Outdoor heat exchanger deicer thermistor
Outdoor heat exchanger liquid pipe
J7
thermistor
Subcooling heat exchanger gas pipe
J9
thermistor
NO
NO
RXTQ36/48TAVJU
Symbol
R1T
R2T
R3T
R5T
R4T
R7T
—
SiUS331604E
Connect the connector and turn on
again.
Replace the defective thermistor.
Replace the outdoor main PCB
(A1P).
RXTQ60TAVJU
Connector Symbol Connector
X11A R1T
R2T
R3T
X12A
R5T
R4T
X13A R7T
— R6T
Service Diagnosis
X11A
X12A
X13A