Daikin SkyAir FHQ24PVJU - Inverter Compressor Startup Abnormality

SiUS281811EA Troubleshooting by Error Codes
Part 6 Service Diagnosis 271
4.43 Inverter Compressor Startup Abnormality
Error Code L9
Applicable
Models
All outdoor units
Method of Error
Detection
Error is detected by the power transistor current
Error Decision
Conditions
Compressor overload during activation
Supposed
Causes
 Defective compressor
 Large pressure difference before starting the compressor
 Defective PCB
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
NO
NO
YES
YES
YES
Does L9 blink after
reconnecting to the power?
When operation
starts, is the high and low
pressure difference greater than 0.2 MPa
(29.0 psi)?
Unbalanced
inverter output voltage
(±5 V is normal). After stabilizing
the inverter, is the inverter
output pressure
measurable?
Disconnect the compressor from the
inverter. Use power transistor to check
codes based on maintenance codes.
Nonconforming pressure
balance. Check the
refrigerant system.
Replace the outdoor
main PCB (A1P).
Reset and then restart
the unit.
Check the compressor according to
diagnosis procedure for compressor
abnormal noises/vibrations and
operation conditions.