Daikin RZQ Series FCQ20EVA Service Manual page 170

Troubleshooting by Remote Controller
CHECK 10
Clogged Points
Temperature differences must occur before or after the clogged points!
Check points
1 Around
expansion
mechanism
2 Accumulator
3 Distributor
4 Field piping
5 Stop valve
161
3
4
Indoor Unit
Check factor Causes
 Dust
Temperature
 Choked moisture
difference
 Reduced effective pipe
 Choked moisture
Frosting
 Dust
Temperature
 Choked moisture
difference
 Reduced effective pipe
 Collapsed pipe
Temperature
difference
 The stop valve is not fully open.
Temperature
difference
1
3
5
2
ACC COMP
Outdoor Unit
diameter due to adherent
contamination, etc.
diameter due to adherent
contamination, etc.
SiME281501E
Remedies
Replace the electronic
expansion valve.
Blow a nitrogen gas, and
then replace the
refrigerant.
Replace the heat
exchanger or distributor.
Replace the pipe.
Open the stop valve fully.
Service Diagnosis