Sonos Arc Soundbar F77 Error Code Fix

Do this in order. This is basically what support will walk you through before they talk replacement.

• 1. Hard power reset and isolation
  Unplug the Arc’s power cable from both the wall and the bar.
  Disconnect everything else: HDMI/eARC, Ethernet, adapters, hubs, sound system, all of it.
  Wait at least 60 seconds so the internal power supply actually discharges.
• 2. Try a clean wall outlet
  Skip the fancy surge strip for now. Plug the Arc’s power cord directly into a different wall outlet (ideally on another circuit if that’s easy).
  If the bar won’t power up properly on a clean outlet and still logs F77, that points away from your house power and toward the Arc itself.
• 3. Boot the Arc by itself
  Power it up with only the power cable connected. No HDMI, no Ethernet.
  Watch the status light:
  • Solid white after startup = it at least booted.
  • Flashing orange/white or going dead again = bad sign, likely internal fault.
  If your Sonos app still sees the Arc and shows an F77-related error, note the timing (on boot, during playback, only at high volume, etc.). Support will ask.
• 4. Reconnect to the Sonos S2 app and update
  If it boots, connect your phone to the same network and open the Sonos S2 app.
  Go to Settings > System > System Updates and force a check.
  Install any pending updates. Firmware glitches can trigger protection modes, and Sonos will always tell you to update before doing anything else.
• 5. Factory reset the Arc (only once)
  Use this as a last software step; it wipes settings.
  Do it like this:
  • Unplug the Arc’s power.
  • Press and hold the Join (∞) button on the Arc.
  • While holding it, plug the power back in.
  • Keep holding until the light flashes orange and white, then release.
  • Wait for the light to flash green – that means it’s reset and ready to be set up again.
  Now re-add it in the Sonos S2 app as a new device and test basic playback. If F77 still shows up after a clean reset and fresh setup, you’re almost certainly looking at hardware.
• 6. When the reset doesn’t clear it: call Sonos
  At this point you’ve done what the manual and first-line support expect:
  • Clean power
  • Standalone boot
  • Latest firmware
  • Factory reset
  If F77 keeps returning, you’re likely dealing with a failing power supply or amplifier module inside the Arc. There’s no user-serviceable part for that.
  Open the Sonos S2 app, go to Support, submit diagnostics, then contact Sonos Support and give them the diagnostic number and tell them the code F77 was mentioned. They’ll check logs and usually move straight to repair/replace options if the hardware’s bad.
• 7. Do not open the Arc yourself
  The housing is glued and clipped; cracking it open is how you turn a maybe-repairable bar into definite junk. Internal boards are not meant for DIY swaps, and you’ll kill any remaining warranty.