Daikin GYEQ20AN Service Manual page 166

Flow Charts for Troubleshooting
28
High-Side Pressure Sensor System Failure
Sub-code 0: While the unit is running, high-side pressure 1 is reported as 5000 kPa (which means that high-
Sub-code 1: While the unit is running, high-side pressure 1 is reported as 5100 kPa (which means that high-
Sub-code 2: High pressure SW1 or high pressure SW2 turns OFF immediately before engine startup (which
Sub-code 3: While the unit is running, high-side pressure 4 is reported as 5000 kPa (which means that high-
Description Sub-code 4: While the unit is running, high-side pressure 4 is reported as 5100 kPa (which means that high-
of the failure
Sub-code 6: While the unit is running, high-side pressure 2 is reported as 5000 kPa (which means that high-
Sub-code 7: While the unit is running, high-side pressure 2 is reported as 5100 kPa (which means that high-
Sub-code 8: While the unit is running, high-side pressure 3 is reported as 5000 kPa (which means that high-
Sub-code 9: While the unit is running, high-side pressure 3 is reported as 5100 kPa (which means that high-
High-side pressure sensor failure; harness failure; main circuit board failure; high-side pressure switch failure;
Possible
causes sub circuit board failure
of the failure
Flow chart
If sub-code 0, 1, 3, 4, 6, 7, 8 or 9
Is High-Side Pressure Sensor
Operating Normally?
YES
155
side pressure sensor 1 is shorted).
side pressure sensor 1 is disconnected).
means that the high-side pressure switch is faulty).
side pressure sensor 4 is shorted).
side pressure sensor 4 is disconnected).
side pressure sensor 2 is shorted).
side pressure sensor 2 is disconnected).
side pressure sensor 3 is shorted).
side pressure sensor 3 is disconnected).
Which Code Is
Onboard Checker Showing?
NO
Is High-Side Pressure Switch
Operating Normally?
Check High-Side
Pressure Sensor.
Check whether sensor and
switch connected properly to
Main Circuit Board and Sub-
Circuit Board's Harnesses.
If sub-code 2
NO
YES
Check High-Side
Pressure Switch.
025896-00EN02
SiAUY361411EA
Error
J7
code
Troubleshooting