Router Overheating, Signs, Causes and Cooling Fixes
Most home routers cool themselves passively through vents in the case, with no fan. When those vents are blocked, or the router sits in a warm enclosed space, heat builds up inside. The result is not always a shutdown. More often it is slow Wi-Fi, random reboots, or the 5 GHz network vanishing under load while 2.4 GHz keeps working.
The fix, in order
Check the symptoms against heat. A case that is very warm to the touch, reboots that happen during heavy streaming or downloads, slow speeds that get worse as the day goes on, and a 5 GHz network that disappears while 2.4 GHz stays up all point to heat.
Move the router into open air. Take it out of any cabinet, off carpet, and away from stacks of other hot electronics such as a cable box or game console. Put it on a hard, flat surface with at least a few inches of clear space on every side, and keep it out of direct sunlight.
Clean the vents. Unplug the router and wipe the outside with a dry cloth. Clear dust from the vents with short bursts from a can of compressed air. Dust acts as insulation and is one of the most common causes of a hot router.
Give it clearance underneath. Raising the router an inch on small rubber feet, or mounting it vertically on a wall, lets cool air enter the bottom vents and hot air rise out the top. Never stack another device on top of the router.
Reduce the load while you test. Disconnect devices you do not need and pause heavy downloads. If the router cools down and the symptoms stop, heat and load together were the problem.
Update the firmware. Outdated firmware can disable hardware acceleration and force the processor to work harder, which generates more heat. Check the admin page or the maker's app for an update.
If the router smells of burning, the case feels soft, or you see smoke or scorch marks, unplug it immediately and do not plug it back in. That is a safety issue. Never open the router case to clean inside, that usually voids the warranty and risks damaging the board.
If it still happens
If the router still overheats in a cool, open spot with clean vents and updated firmware, the hardware is most likely aging. Old routers lose cooling efficiency as thermal pads dry out, and a router that overheats under normal load in a normal room is usually at the end of its life. Check the warranty with the manufacturer, or replace it with a model suited to the size of your home and the number of devices.
Common questions
How hot should a router feel? Warm is normal, especially during heavy use. If it is too hot to touch comfortably, or the plastic feels soft, it is too hot and needs better airflow.
Can overheating make Wi-Fi slow? Yes. When a router gets too hot, it can throttle performance, shut down the 5 GHz radio, or reboot. Slow speeds that get worse during heavy use are a classic sign.
Will a small fan help a hot router? It can help in a warm room, but it is not a substitute for cleaning the vents and moving the router into open air. Fix the airflow first, then add a fan if the room still runs hot.