Daikin GYEQ20AN Service Manual page 148

Flow Charts for Troubleshooting
7
Abnormal High-Side Pressure
Sub-code 0: While the unit is running, high-side pressure 1 rises to 3.85 MPa or higher.
Sub-code 1: While the unit is running, high pressure SW1 or high pressure SW2 turns OFF, clutch 1 turns ON,
Description Sub-code 2: While the unit is running, high-side pressure 4 rises to 3.25 MPa or higher.
of the failure Sub-code 4: While the unit is running, high pressure SW1 or high pressure SW2 turns OFF, clutch 1 turns ON,
Sub-code 5: While the unit is running, high pressure SW1 or high pressure SW2 turns OFF, clutch 1 turns
Possible
Sensor failure; refrigerant overcharged; EV failure; four-way valve failure; SV failure;
causes refrigerant piping clogged; compressor failure; fan failure; outdoor heat exchanger clogged;
of the failure indoor heat exchanger clogged; short circuit; stop valve failure; external filter clogged
Flow chart
Is Outdoor Heat Exchanger
Free From Clogging?
YES
Are Indoor Unit Filters
And Indoor Heat Exchanger
Free From Clogging?
YES
Is Unit Free From
Short Circuits?
YES
Are Fans Operating Normally?
YES
Are Stop Valves Opened?
YES
Is SV1 operating normally?
YES
Are EVs Operating Normally?
YES
Is High-Side Pressure Switch
Operating Normally?
YES
Is High-Side Pressure Sensor
Operating Normally?
YES
Are Compressor Clutches
Operating Normally?
YES
Is the four-way valve operating normally?
Are the SV3A-3F and SV31 operating normally?
YES
Are Pipes
Free From Clogging?
YES
Are You Sure Refrigerant
Is Not Overcharged?
YES
Is Oil Separator
Operating Normally?
YES
Check the external filter.
137
and clutch 2 turns ON.
and clutch 2 turns OFF.
OFF, and clutch 2 turns ON.
NO
Check Clogging.
NO
Check Clogging.
NO
Check Short-circuit.
NO
NO
Check Stop Valves.
NO
NO
NO
Check High-Side Pressure Switch.
NO
Check High-Side Pressure Sensor.
NO
Check Compressor Clutches.
NO
Four-way valve/SV inspection
NO
See Refrigerant System Diagram.
NO
Check Refrigerant Amount.
NO
Inspecting the oil separator
Check Fans.
Check SV1.
Check EVs.
025870-01EN04
SiAUY361411EA
Error
E7
code
Troubleshooting