CC1 + Canvas: How to fix the persistent "Nozzle front cover detached" warning.
I installed my Canvas yesterday, and like many of you, started getting the "front cover detached" message every time I powered it on.
I believe the reason this is happening is that the magnet in the front cover is just a little too far back in its housing, and isn't being picked up by the Hall sensor on the sensor board.
I tested this hypothesis by removing the nozzle cover and attaching a magnet to the front of the board, with a piece of paper placed behind it to prevent it from shorting out any components. As expected, no warning when I powered it on. The fix is pretty simple.
Step 1) Remove the nozzle cover and the extruder cover.
Step 2) Loosen the two #1 Phillips-head screws that hold the sensor board.
Step 3) Take a small strip of paper, fold it twice, place it under the bottom edge of the sensor board, and tighten the screws.
Step 4) Reinstall the covers, power on, and you should no longer get the warning. This worked for me on the first try, but it's possible yours may require more shimming than mine did. If you still get the warning, try adding one or two more layers of paper.
Posted Jul 5, 2026, 8:56 PM UTC