Daikin GYEQ20AN Service Manual page 157

SiAUY361411EA
Flow chart
When Sub-code is 2 3
Is There 6 Hours or More
Power-Up Time Prior to Running?
YES
Is Correct Procedure
Used for Additional
Refrigerant Charging?
YES
IS Power-ON Start /
Power-OFF Stop Enabled?
YES
Is Power Turned On
Normally? ∗
YES
Are Filter and Heat
Exchanger in Indoor Unit Not
Contaminated?
YES
Is Indoor Unit Fan
Operating Normally?
YES
Is EV of Indoor and
Outdoor Units Operating
Normally?
YES
Is the BS unit
operating normally?
YES
Is Check Valve
Operating Normally?
YES
Is the four-way valve operating normally?
Are the SV3A-3F and SV31 operating normally?
YES
Is Heater Operating Normally?
YES
Is High-Side Pressure Sensor
Operating Normally?
YES
Is Low-Side Pressure Sensor
Operating Normally?
YES
Are Oil Temperature Sensors
Operating Normally?
YES
Are Intake Air Temperature
Sensors Operating Normally?
YES
Are Discharge Temperature
Sensors Operating Normally?
YES
Is Refrigerant Charging
Amount Normal?
(Not Overcharged)
YES
It is possible to happen FH
error during cooling operation
with low outside temperature.
Please consider to install Air
guard. (Option product)
Troubleshooting
NO
Maintain Power-Up Time
NO
Start Improper Additional
Refrigerant Charging Recovery Mode
NO
Disable Power-ON/
Power-OFF Stop
NO
Start Improper Additional Refrigerant
Charging Recovery Mode
∗ Do not turn ON the power for the indoor unit
only (indoor unit first) after turning OFF the
power for the indoor and outdoor units.
Do not turn OFF the power for the indoor unit
or turn ON the power for the outdoor unit first.
NO
Clean/Wash
NO
Check Indoor Unit Fan.
NO
Check EV.
NO
BS unit inspection
NO
Check Check Valve.
NO
Four-way valve/SV inspection
NO
Check Heater.
NO
Check High-Side
Pressure Sensor.
NO
Check Low-Side
Pressure Sensor.
NO
Check Oil Temperature
Sensors.
NO
Check Intake Air
Temperature Sensors.
NO
Check Discharge
Temperature Sensors.
NO
Check Refrigerant
Charging Amount.
Flow Charts for Troubleshooting
030479-00EN02
146