Daikin GYEQ20AN Service Manual page 141

SiAUY361411EA
3
Unit Runs But Does Not Heat
Flow chart
Unit Runs But Does Not Heat
Is Remote Control Heating
Temperature Set-Point Higher
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
Is the thermostat
operating normally?
Is the water motor valve
operating normally?
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
indoor 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.
Troubleshooting
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
Replace thermostat components
Replace water motor valve
NO
Check Indoor Unit Fans.
NO
Check Cables For Defects.
NO
Check Pipes.
NO
Check the external filter.
Flow Charts for Troubleshooting
025863-00EN02
130