Heating while charging

Your iPhone 14 Plus will get warm as it charges. It may even get hot at times depending on ambient conditions and the level of charge applied. All this is normal. If your iPhone gets too hot to operate then it will shut down as a safety precaution. If it has not shut down then it is not overheating and operating / charging normally.

If your iPhone 14 Plus gets too hot to touch then you can have it examined at the Apple Store or at an Authorized Service Center and take advantage of the 1YR Limited Warranty from Apple.

Axel F.

While it has nothing to do with the phone getting warm while charging, you are not following an optimal charging strategy. The absolute best way to get maximum use on a charge, as well as slow the decline of battery capacity long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern. If you enable iCloud Backup (Settings/[your name]/iCloud - iCloud Backup) the phone will back up overnight also, assuring that you can never lose more than the current day’s updates. Here's more information→About Optimized Battery Charging on your iPhone - Apple Support