Inverter Compressor Startup Abnormality - Daikin SkyAir RZR-TA Series Service Manual

SiUS281811EA

4.43 Inverter Compressor Startup Abnormality

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