Sonos Arc Soundbar F57 Fix: No‑Nonsense Error Code Guide

Here’s the Sonos-style playbook: clean power, basic reset, then support. Run this in order.

• 1. Hard power reset the Arc
  • Unplug the power cord from the wall and from the Arc.
  • Disconnect the HDMI cable from the TV and the Arc.
  • Leave it unplugged at least 60 seconds (90 is better).
  • Plug the Arc directly into a wall outlet – no surge strip, no smart plug.
  • Do not reconnect HDMI yet; just power only.
  • Watch the LED on top:
    • No light at all after 1–2 minutes = it’s not booting properly.
    • White flashing then solid white = it at least started the OS.
• 2. Try a known-good outlet and circuit
  • Move the Arc to a different wall outlet you know works (same room or another room).
  • Plug it in alone, no TV, no HDMI, no power strip.
  • If it’s still dead or drops out and support later pulls F57 from logs, that rules out your house wiring as the main cause.
• 3. Swap the power cable
  • The Arc uses a standard C7 “figure‑8” 2-prong power cord.
  • Borrow one from another device (PlayStation, small amp, some TVs) or a spare.
  • Plug that straight into the wall and the Arc, no other changes.
  • If it suddenly behaves, your original cord was suspect. If not, the fault is inside the soundbar.
• 4. If it boots, test it before you rebuild your setup
  • Once you see a solid white LED, open the Sonos app.
  • Check if the Arc shows up and can play an internet radio station or simple music source.
  • Let it run for 10–15 minutes at a moderate volume.
  • If the Arc cuts out, vanishes from the app, or F57 is mentioned again, note the time – support will want that for diagnostics.
• 5. Last resort software step: factory reset (only if it will boot)
  • Sonos generally does not recommend random factory resets, but for a persistent fault they may ask you to try it.
  • To reset an Arc:
    • Unplug the power cord from the Arc.
    • Press and hold the Join button (∞ symbol on top).
    • Keep holding it while you plug the power cord back in.
    • Hold until the light flashes orange and white, then release.
    • When it starts flashing green, set it up again in the Sonos app.
  • If the reset fails, the LED never behaves, or F57 keeps coming back, that confirms you’re past anything a reset can fix.
• 6. When the above fails: escalate to Sonos support
  • Grab the Arc’s serial number (on the label on the bottom/back or in the app if it still shows).
  • Contact Sonos via chat or phone and ask them to run a diagnostic on your Arc.
  • Mention you’re seeing F57 / fault 57 and describe the LED behavior.
  • If their logs confirm an internal hardware fault, the official fix is replacement:
    • Under warranty: usually a straight swap.
    • Out of warranty: typically a discounted “trade‑up” offer on a new Arc or similar model (exact deal depends on region and age).

There is no official, user‑serviceable repair for F57. Sonos does not sell internal power/amp boards to the public; they expect the bar to be replaced, not opened.