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Fujitsu "AOU18RLXFZ 18,000 BTU Halcyon HFI Outdoor Unit" - Page 8 Questions & Answers
Fujitsu asta12lcc timer flashes 5 times
From the service manual:
Serial forward transfer error during the operation
When the outdoor unit does not receive the signal for 10 consecutive seconds during the operation > Outdoor unit stops.
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)
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