Thermistor System Abnormality - Daikin GQI-Eco Series Service Manual

Troubleshooting by Remote Controller

4.22 Thermistor System Abnormality

H9, J3, J5, J6, J7, J8
Remote
Controller
Display
RZQG
Applicable
Models
The error is detected according to the temperature detected by each individual thermistor.
Method of Error
Detection
When thermistor is disconnected or short circuited during operation
Error Decision
Conditions
 Defective thermistor
Supposed
 Defective connection of connector
Causes
 Defective outdoor unit PCB (A1P)
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Check connectors for connection.
Is it normal?
YES
Remove thermistor from outdoor unit
PCB, then measure the resistance
using a tester.
CHECK 1
Is it normal?
YES
Error Code
H9
Outdoor air thermistor
J3
Discharge pipe thermistor
J5
Suction pipe thermistor
J6
Heat exchanger thermistor
J7
Intermediate heat exchanger thermistor
J8
Liquid pipe thermistor
Refer to P.185.
CHECK 1
154
NO
NO
Defective Thermistor
Connect correctly.
Replace the thermistor.
Replace the outdoor unit PCB
(A1P).
Symbol
R1T
R2T
R3T
R4T
R5T
R6T
ESIE15-13B
Service Diagnosis