Daikin ZQG71~140L7V1B Service Manual page 214

Troubleshooting by Remote Controller
CHECK 9
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
202
3
4
Indoor Unit
Check factor Causes
Temperature  Dust
difference  Choked moisture
 Reduced effective pipe
Frosting  Choked moisture
Temperature  Dust
difference  Choked moisture
 Reduced effective pipe
Temperature  Collapsed pipe
difference
Temperature  The stop valve is not fully open.
difference
1
3
5
2
ACC COMP
Outdoor Unit
diameter due to adherent
contamination, etc.
diameter due to adherent
contamination, etc.
ESIE12-06
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