Some warmth during gaming or fast charging is normal, especially on the performance-focused ROG Phone line, but sustained heat during light use signals a background process or a charging issue worth fixing before it damages the battery.
- 1Check which app is running when it overheats: Settings → Battery → Battery usage, a runaway app pegging the CPU is the most common cause outside of gaming.
- 2If it's a ROG Phone overheating during gaming, confirm the AeroActive Cooler (if you own one) is properly seated, and check X Mode's thermal profile, switching from 'Extreme' to 'Standard' reduces heat significantly with a modest performance trade-off.
- 3Remove the case during heavy use or charging, Zenfone and ROG Phone bodies are designed to dissipate heat through the back panel, a thick case traps it.
- 4Stop charging immediately if the phone becomes uncomfortably hot rather than warm, unplug, let it cool fully, then check the charger and cable are genuine or PD-compliant before reconnecting.
- 5Update system software: Settings → System → System update, Asus has shipped thermal management fixes for specific Zenfone and ROG Phone models in past patches.
- 6Run our Battery Status tool to monitor temperature readings over a session, sustained readings above the low-40s Celsius during light use point to a stuck background process, not normal operation.
Tip: ROG Phones run hotter by design during X Mode gaming sessions, this is expected engineering, not a fault, the concern is heat during idle or light browsing, which always points to a software issue worth chasing down.