Daikin GYEQ20AN Service Manual page 140

Flow Charts for Troubleshooting
2
Unit Runs But Does Not Cool
Flow chart
Unit Runs But Does Not Cool
Is Cooling Set
Temperature Lower
Than Room
Temperature?
YES
Are You Sure
Failure Bypass Control
Is Not Activated?
YES
Is Compressor
Intake/Discharge Pressure
Normal?
YES
Is the four-way valve
operating normally?
Are the SV3A-3F and SV31
operating normally?
YES
Are Outdoor Unit EVs
and SVs Operating Normally?
YES
Is Recharged Refrigerant
Amount Proper?
YES
Are Indoor Unit Fans
Operating Normally?
YES
Is the wiring between the
outdoor unit/indoor unit/BS unit
operating normally?
YES
Is the piping between the
outdoor unit/indoor unit/BS unit
operating normally?
YES
Is the external filter free
of defects?
YES
Please contact your Daikin
(Yanmar) representative if
you can not find the cause
even after you have checked
all the items down to the
bottom of the flowchart.
129
NO
Change Temperature
Set-Point.
NO
Check Failure Bypass
Control Conditions.
NO
See "Standard Operation
Data List."
NO
Four-way valve/SV inspection
NO
Check EVs and SVs.
NO
Check Recharged
Refrigerant Amount.
NO
Check Indoor Unit Fans.
NO
Check Cables For Defects.
NO
Check Pipes.
NO
Check the external filter.
025862-00EN01
SiAUY361411EA
Troubleshooting