Before doing this, make sure the device is disconnected from the power source. The device contains a fuse located on the control board, housed in a plastic casing mounted under the cover.
To replace it:
1. Disconnect the device from power.
2. Use a screwdriver to unscrew the 6 screws on the front, left, and right of the cover (loosening by 1-3 turns is enough, no need to remove them fully).
3. Remove the rear grid by unscrewing all 4 screws, then open the cover by lifting it upward — be careful not to damage the wires.
4. Under the cover, the plastic casing holding the control board is secured with a hook-and-loop fastener; before detaching it, disconnect the 4 connectors (on earlier units the buttons may be attached without connectors) — note the position of all 4 connectors to reconnect them correctly.
5. The casing is secured with 4 screws at the corners; unscrew them to access the fuse and replace it.
6. Reverse the steps: close the casing, close the cover, reattach the rear grid, and tighten the 6 screws.
If not comfortable doing this, contact support at support@mosqitter.com.