Daikin GYEQ20AN Service Manual page 160

Flow Charts for Troubleshooting
21
Clutch Failure
Sub-code 0: While the unit is running, PH-PL is higher than 500 kPa and the deviation from the target engine speed
Description
Sub-code 1: Within 5 seconds after the second clutch is engaged, the following conditions are detected in this
of the failure
Sub-code 2: While the unit is running, PH-PL remains below 300 kPa for 5 minutes.
Possible Pressure sensor failure; compressor failure; rib belt failure; compressor clutch failure; SV failure;
causes four-way valve failure; short of refrigerant
of the failure
Flow chart
Are Pressure Sensors
Operating Normally?
YES
Is Engine Speed Normal?
YES
Are Compressor Armatures
Operating Normally?
YES
Is Crank Pulse Sensor
Operating Normally?
YES
Is Ribbed Belt Non-Defective?
YES
Is Clutch Voltage/Resistance
Normal?
YES
Is Air Gap In Clutches Normal?
YES
Are Clutch Surfaces
Free From Oil Or Other
Foreign Matter?
YES
Are Clutches Free From
Abnormal Noise And Sparks
When Unit Is Running?
YES
Are Compressors
Operating Normally?
YES
Is SV Operating Normally?
YES
Is Four-Way Valve
Operating Normally?
YES
Check whether Refrigerant
Amount is sufficient.
149
remains equal to or higher than 500 min
elapse after the clutch is operated. The alarm condition is judged 5 seconds after the clutch is operated.
exact order: 1) The engine speed momentarily drops by 150 min
-1
150 min ; 3) the clutch is engaged at an engine speed higher by 500 min
NO
Check Pressure Sensors.
NO
Check Engine Speed.
NO
Check Compressors.
NO
Check Crank Pulse Sensor.
NO
Check Ribbed Belt.
NO
Check Compressor Clutches.
NO
Check Compressor Clutches.
NO
Check Compressor Clutches.
NO
Check Compressor Clutches.
NO
Check Compressors.
NO
NO
Check Four-Way Valve.
-1
for 0.5 seconds. This condition is not judged until 20 seconds
Check SVs.
025884-00E00
SiAUY361411EA
Error
H1
code
-1
; 2) the engine speed rises by
-1
.
Troubleshooting