Fujitsu Waterstage 15 flashes fault code
Fujitsu Waterstage heat pumps
What it means
Compressor start-up error (permanent stoppage)
Compressor start-up error (permanent stoppage)
UK models this code applies to
From the Fujitsu service literature we hold (Fujitsu Waterstage Super High Power D&T Manual, §Control System pp.03-3…03-5 — numeric display codes, interface-card LED pairs and outdoor-board flash counts with the published decode procedure) — not a scraped list.
Waterstage Comfort 5 (WOYA060KLT + WSYA050ML3)Waterstage Comfort 6 (WOYA060KLT + WSYA080ML3)Waterstage Comfort WOYA080KLTWaterstage Comfort WOYA100KLTWaterstage Super High Power WOYG160LJL (1-phase)Waterstage Super High Power WOYK150LJL (3-phase)Waterstage Super High Power WOYK170LJL (3-phase)
Now the harder half: proving what caused it
15 flashes names a symptom, not a root cause. In the app, the same code opens a guided investigation: what to measure first, the expected values for your exact model, and an honest verdict — including “nothing in this machine is broken” when that's what the readings say.
Watch a code get chased — free demo →