Please refer to the following methods to try to solve.
1. Restart the iPhone
If the iPhone wireless charging suddenly does not charge, it may be because there are sometimes unpredictable errors in the update of the iOS system, which will cause problems with the wireless charging function, usually as long as the restart can be solved.
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2. Remove the iPhone case
Sometimes the iPhone protective case is too thick will also lead to wireless charging, then you can try to remove the iPhone protective case, and then put back on the wireless charging board to charge.
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3. Determine whether the iPhone is placed in the wireless charging block
At present, most wireless chargers have only a few coil design, the iPhone is placed in the specified position to be able to charge, it may be to confirm the placement is not placed, if it happens intermittently, may not be placed correctly, you can try to change the Angle or find the best charging position for wireless charging.