Warmth is an observation, not a diagnosis
These are external checks for a home router you own or are authorised to manage. They do not cover opening equipment, electrical repair or provider connection-box servicing. A modem, router, mesh point and mobile hotspot can have different power, temperature and support requirements.
Step 1 of 6
In this guide
Stop for danger or damaged equipment
Stop for danger or damaged equipment
If you notice smoke, a burning smell, melting, swelling, sparks, liquid damage or a damaged lead or adapter, stop ordinary connection checks. Keep people clear and do not handle equipment that may be hot or electrically unsafe. For an active fire or immediate danger, move to safety and contact emergency services. Do not delay safety action to save a connection or record a photograph.
Do not touch a damaged plug, wet equipment or exposed parts. Only isolate power if you can do so safely without approaching the hazard; otherwise leave that to emergency or qualified assistance. Do not reconnect suspect equipment just to see if the smell or shutdown returns. The Electrical Safety Office’s equipment guidance says faulty equipment should not be used.
Contact the equipment provider or manufacturer for safe replacement/service arrangements; electrical supply, socket or wiring concerns need a licensed electrician. If a battery-powered hotspot is swollen or damaged, do not press, puncture or remove its battery. Keep it out of further use and obtain the appropriate safe handling advice. These signs end the self-check path.
Damage or danger signs mean stop and seek appropriate help; cooling down does not clear suspect equipment for reuse. Continue only where those signs are absent.
Identify the device and what the warning means
Identify the device and what the warning means
Confirm whether the device is your router, modem, mesh point, provider connection box or mobile hotspot. Use existing paperwork, an authorised management app or a safely readable model label. Do not pick up or turn over suspect hot equipment to read underneath it. Keep serial numbers, passwords and network codes private.
Read the legitimate model manual for placement, orientation, power supply, ambient operating conditions and any temperature warning. Some equipment produces warmth during normal use; a hand on the case cannot establish an internal temperature or prove safe operation. Manufacturer router safety guidance illustrates why heat, handling and power requirements are model-specific. Its numerical limits are not a universal limit for every router.
Record the exact warning or light pattern and whether connectivity or power is affected. Do not assume every reboot or slow download is caused by heat. If the model or warning cannot be identified, ask the provider before making changes. If the device is working normally within its documented setup, there is no need to reset or replace it solely because it is warm.
Keep the exact model and observed warning separate from a heat diagnosis. A familiar-looking box or a different model’s temperature limit is not sufficient.
Check external placement and airflow
Check external placement and airflow
From a safe position, check whether vents are covered, equipment is stacked, an enclosure traps heat or direct sun or another heat source reaches the unit. Follow the manual’s intended orientation and clearances. Keep the router and its power supply in an appropriate ventilated location; do not cover them with papers or place them on soft fabric.
If a safe placement change is needed, plan it before moving anything. Check phone, medical/alarm monitoring, work and other shared dependencies with their responsible provider or user. Follow the model’s shutdown/disconnection instructions and allow safe handling before relocation. Do not pull on a lead, stretch fixed wiring, move provider equipment or disconnect fibre to reach another shelf. Skip the move if safe access or the required interruption is uncertain.
For an external clean, follow the exact manual with power safely disconnected. Do not spray liquid, insert tools into vents, use an improvised fan installation or remove the case. Leave internal dust, damaged connectors and repairs to authorised support. Improve an obvious external obstruction only where safe, then retain the original fault observations; clearer airflow by itself does not prove the equipment is healthy.
A suitable location is a precaution, not proof that a shutdown was thermal or a damaged device is safe. Do not continue with a hazard or uncertain interruption.
More checks3 detailed checks
Check power compatibility without substituting adapters
Check power compatibility without substituting adapters
Using existing records or safe external inspection, confirm the power adapter is the one supplied or explicitly approved for the exact device. Different voltage, polarity, current requirements and connector arrangements can matter. Do not try an adapter from another device because it fits, splice a lead or use a travel adapter as a repair for damaged power equipment.
Report an unexpected replacement adapter, persistent discolouration, damage or uncertain rating to the provider/manufacturer. Do not unplug and inspect a suspect hot adapter by hand. If the socket, power board or supply is in question, use qualified electrical help rather than keep swapping equipment. No internet setting can repair that issue.
Mobile hotspots may have removable batteries and specific supported power modes. One manufacturer’s mobile-router guidance describes model-specific thermal behaviour; its battery-removal instructions must not be applied to other routers or hotspots. Do not remove a battery, change power mode or override thermal protection from a general internet guide.
Keep the confirmed approved supply and model information. Compatibility uncertainty or suspect power equipment is a stop condition, not a prompt to experiment.
Follow supported recovery and check normal use
Follow supported recovery and check normal use
If there are no danger or damage signs, and the model/provider instructions permit recovery after a heat warning, follow that process in a suitable environment. Do not invent a universal cooling time, force repeated restarts or bypass a protective shutdown. If the unit is already operating normally within its documented arrangement, a restart is not required just for reassurance.
Use ordinary activity to check whether the warning or original dropout returns. Do not run a prolonged stress test, block vents to reproduce the issue or leave suspect equipment operating unattended. Record the time, room conditions and exact behaviour if it recurs, then stop further recovery attempts and contact the responsible provider. An indicator returning to normal is not an electrical safety certificate.
Where a supported change was made, confirm the intended connection and any shared or essential services through their approved checks. Restore any agreed temporary changes. If normal use remains satisfactory and there is no warning, stop changing things. If connectivity is still unreliable without a heat warning, use the dropout investigation rather than label it overheating without evidence.
Stop after supported normal use and required dependencies are verified without warnings. A brief successful restart does not establish permanent repair or clear previously damaged equipment.
Back to the symptom checkerRecord recurring symptoms and get the right help
Record recurring symptoms and get the right help
Give the provider/manufacturer the model, warning, timing, location, approved power-supply details and what stopped working. State any damage or smell separately from a connection complaint. Use a legitimate private support channel, and avoid sharing passwords, full labels, account credentials or configuration exports publicly. Do not turn suspect equipment back on to collect more evidence.
Provider-supplied routers and NBN equipment need the appropriate provider’s process. An electrician handles supply/socket/wiring concerns. Managed networks and essential connected services need their responsible team. Ask about safe replacement, continuity and the required checks rather than assume a different router will preserve phone, monitoring or service settings.
For safe local placement or connectivity planning after equipment safety is resolved, our Wi-Fi and network setup support can help assess the arrangement. Agree the scope and dependencies; this is not a promise to repair electrical equipment or certify it safe.
Preserve safety, essential-service arrangements and private evidence. Support referral or replacement planning is not a completed repair or permission to reuse damaged equipment.
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