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.
Summary of Contents for SkyAir RZR-TA Series
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Page 323: ...SiUS281811EA Wiring Diagrams Part 7 Appendix 317 RZR18 24TAVJUA RZQ18 24TAVJUA 3D124495...
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