Daikin GYEQ20AN Service Manual page 162

Flow Charts for Troubleshooting
23
Air-Fuel Ratio Controller Failure
Sub-code 0: While the unit is running, the air-fuel ratio controller does not function properly.
Description Sub-code 1: While the unit is running, the following conditions continue for 3 minutes: 1) the throttle valve
of the failure
Possible Mixer malfunction
causes
of the failure
Flow chart
Check Mixer.
025890-00E
Intake Air Temperature Sensor 1 Disconnected /
24
Shorted
Sub-code 0: While the unit is running, intake air temperature 1 is reported to be equal to 200°C (which means
Sub-code 1: While the unit is running, intake air temperature 1 is reported as 201°C (which means that intake
Sub-code 2: While the unit is running, intake air temperature 2 is reported as 200°C (which means that intake
Sub-code 3: While the unit is running, intake air temperature 2 is reported as 201°C (which means that intake
Sub-code 4: While the unit is running, intake air temperature 3 is reported as 200°C (which means that intake
Description
Sub-code 5: While the unit is running, intake air temperature 3 is reported as 201°C (which means that intake
of the failure
Sub-code 6: While the unit is running, intake air temperature 4 is reported as 200°C (which means that intake
Sub-code 7: While the unit is running, intake air temperature 4 is reported as 201°C (which means that intake
Sub-code 8: While the unit is running, intake air temperature 5 is reported as 200°C (which means that intake
Sub-code 9: While the unit is running, intake air temperature 5 is reported as 201°C (which means that intake
Possible
Intake air temperature sensor failure; harness failure; main circuit board failure; sub circuit board failure
causes
of the failure
Flow chart
Is Intake Air Temperature
Sensor Operating Normally?
YES
Check whether sensor
connected properly to Main
Circuit Board's and Sub-
Circuit Board's Harnesses.
151
opening degree is equal to or lower than 500 pulses; 2) the current speed is equal to or lower
-1
than 1150 min ; 3) the current speed is equal to or lower than the target speed minus 100 min
that intake air temperature sensor 1 is disconnected).
air temperature sensor 1 is shorted).
air temperature sensor 2 is disconnected).
air temperature sensor 2 is shorted).
air temperature sensor 3 is disconnected).
air temperature sensor 3 is shorted).
air temperature sensor 4 is disconnected).
air temperature sensor 4 is shorted).
air temperature sensor 5 is disconnected).
air temperature sensor 5 is shorted).
NO
Air Temperature Sensor.
Check Intake
025891-00E01
SiAUY361411EA
Error
J1
code
Error
J2
code
Troubleshooting
-1
.