Discharge Pipe Temperature Abnormality - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

Troubleshooting by Error Code

4.25 Discharge Pipe Temperature Abnormality

F3
Error Code
Applicable
All outdoor units
Models
Method of Error
Abnormality is detected according to the temperature detected by the discharge pipe thermistor.
Detection
Error Decision The discharge pipe temperature rises to an abnormally high level.
Conditions The discharge pipe temperature rises suddenly.
Supposed
Causes
Troubleshooting
CHECK 11
177
Defective discharge pipe thermistor (R2T)
Disconnection of discharge pipe thermistor (R2T)
Defective outdoor unit PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
When the
unit stops operating
because of an error, is the discharge
pipe temperature higher than
120˚C (248˚F)?
NO
Pull the discharge pipe thermistor out from
the outdoor unit PCB and then measure
the resistance by multifunction tester.
Are the
discharge pipe thermistor
properties normal?
CHECK 11
YES
Refer to page 231.
YES
NO
SiUS331604E
Short of refrigerant,
compressor failure, etc.
refrigerant system failure.
Replace the discharge
pipe thermistor (R2T).
Replace the outdoor
main PCB (A1P).
Service Diagnosis