Troubleshooting by Error Code
3.51 Momentary Power Failure during Test Operation
Applicable
All outdoor unit models
Models
L2
Error Code
Method of Error
Momentary power failure is detected by the PCB.
Detection
Error Decision
Judgment is made by AC power frequency detection circuit on the outdoor unit main PCB.
Conditions
Supposed
Defective wiring
Causes
Defective outdoor unit main PCB
Troubleshooting
313
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Error
recurs after
NO
turning OFF the power
and ON again.
YES
Any
disconnection
of connectors, loose
contact or wiring
YES
disconnection in the
transmission wirings to the
outdoor unit main
PCB?
NO
SiUS341802EC
Temporary problem
Correct any fault.
Replace the outdoor unit
main PCB (A1P).
Part 6 Service Diagnosis