Thermistor System Abnormality - Daikin RZQ Series FCQ20EVA Service Manual

SiME281501E

4.25 Thermistor System Abnormality

H9, J3, J5, J6, J7, J8
Error Code
Applicable RZQ
Models
Method of Error
The error is detected according to the temperature detected by each thermistor.
Detection
Error Decision
When thermistor is disconnected or short-circuited during operation
Conditions
 Defective thermistor
Supposed
 Defective connection of connector
Causes
 Defective outdoor unit control PCB
Troubleshooting
Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
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 thermistor
J7
Intermediate heat exchanger thermistor
J8
Liquid pipe thermistor
CHECK 1 Refer to P.152.
Service Diagnosis
NO
Is it normal?
YES
NO
CHECK 1
Is it normal?
YES
Defective Thermistor
Troubleshooting by Remote Controller
Connect correctly.
Replace the thermistor.
Replace the outdoor unit control
PCB (A1P).
Electric Symbol
R1T
R2T
R3T
R4T
R5T
R6T
122