Inverter Compressor Startup Abnormality - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

SiUS331604E

4.34 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
Causes
Troubleshooting
Service Diagnosis
Defective compressor
Large pressure difference before starting the compressor
Defective PCB
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
NO
NO
Troubleshooting by Error Code
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.
186