Symptoms
- Adapter is uncomfortably hot, not just warm
- Heat increases the longer it's plugged in or charging
- Adapter is charging a high-power device like a laptop
- Plastic casing feels soft, warped, or discolored
Likely causes
- CommonAdapter undersized for the device's power drawUsing a low-wattage adapter to charge a device that wants more current makes it run hotter than designed.
- CommonPoor ventilation around the adapterChargers tucked behind furniture or under blankets can't dissipate heat properly.
- PossibleAging internal componentsCapacitors and other parts lose efficiency with age, generating more heat for the same output.
- PossibleManufacturing defect or counterfeit adapterOff-brand or fake adapters often lack proper thermal design and safety cutoffs.
- Less commonAdapter is actively failingExcessive, escalating heat can precede a full failure or safety shutoff.
What to do
- Unplug the adapter and let it cool if it's uncomfortably hot to hold, before doing anything else.
- Check that the adapter is rated for at least the wattage the device requires.
- Make sure the adapter has open air around it rather than being covered, boxed in, or under bedding.
- Look for warping, discoloration, or a burnt smell on the casing, and discard it if you see any of those.
- Avoid off-brand or unbranded adapters, especially for higher-power devices like laptops.
- If a properly rated, well-ventilated, name-brand adapter still runs excessively hot, replace it.
Tools and parts
- None required
Properly rated replacement adapterSearch: “laptop or phone AC adapter replacement”
When to call a pro
No professional repair for a hot adapter; replace it, especially if you notice warping, discoloration, or a burnt smell.
Safety
Use caution
Never charge a device under a blanket, pillow, or in a bag; a hot adapter or battery in an enclosed space is a fire risk.