How to Fix CPU Over Temperature Error in Windows 11 (25H2)

Seeing a “CPU over temperature error” message when you power on your PC is never a good sign — but it’s a fixable one. This error appears in your BIOS/UEFI when your processor’s temperature has climbed beyond a safe threshold, and it’s your motherboard’s way of preventing permanent hardware damage. Whether it happens every morning at startup or only after prolonged use, the root cause is almost always tied to heat management. This guide walks you through seven practical fixes to eliminate the error and keep your CPU running at a healthy temperature in Windows 11(25H2).

What Causes the CPU Over Temperature Error?

Before diving into the fixes, it helps to understand why your CPU is running hot in the first place. Several common culprits can trigger this error:

• CPU overclocking: Pushing your processor beyond its rated clock speed dramatically increases heat output. Even modest overclocks can push temperatures into dangerous territory if cooling isn’t adequate.
• Cooling system failure: A clogged heatsink, dried-out thermal paste, or a malfunctioning CPU cooler fan will all cause temperatures to spike rapidly under load.
• High CPU usage: Background processes or runaway applications that constantly pin your CPU at near-100% usage generate sustained heat that overwhelms cooling solutions.
• Poor airflow: A case with blocked vents, cables obstructing airflow, or a cramped environment prevents heat from escaping your system efficiently.

Fix 1: Clean Your Air Intake Fans

Dust is the silent enemy of any cooling system. Over time, dust and debris build up on fan blades and heatsink fins, acting as an insulating layer that traps heat right where you least want it. If your PC hasn’t been cleaned in six months or more, this is very likely contributing to your overheating problem.

To clean your cooling components safely, start by powering down your PC completely and unplugging it from the wall. Open the side panel of your case. Use a can of compressed air to blow dust out of the intake fans, exhaust fans, CPU cooler heatsink, and any other heat sinks inside the case. Hold each fan blade still while you spray to prevent the fan from spinning faster than its rated speed, which can damage the bearings. Work in a well-ventilated area or outdoors — you’ll be surprised how much dust comes out.

While you have the case open, inspect the thermal paste between your CPU and its heatsink. If it’s more than two to three years old or appears dried and cracked, replacing it with a fresh application of quality thermal compound (such as Arctic MX-4 or Noctua NT-H1) can drop CPU temperatures by 10–20°C.

Fix 2: Ensure Proper Case Ventilation

Even a spotlessly clean cooling system can’t perform if hot air has nowhere to go. Your PC case needs a clear path for cool air to enter and hot air to exit — when that airflow is obstructed, temperatures creep up steadily.

Check that your PC isn’t placed in an enclosed cabinet, directly against a wall, or sitting on carpet that can block bottom-mounted intake vents. Desktop towers should have at least 10–15 cm of clearance on all sides. If your PC lives under a desk, make sure the area isn’t cluttered with boxes or bags that restrict airflow.

Inside the case, tidy up cable management. Loose cables bunched in front of intake fans act as a physical barrier. Use zip ties or velcro straps to route cables along the edges and behind the motherboard tray. If your case allows it, verify that your fans are configured correctly — intake fans at the front and bottom pulling cool air in, exhaust fans at the rear and top pushing hot air out.

Fix 3: Disable CPU Overclocking

If you or a previous owner has overclocked the CPU, reverting to stock settings is one of the fastest ways to bring temperatures back under control. Overclocking multiplies both performance and heat output — an overclock that was marginally stable in winter can trigger over-temperature errors when ambient room temperature rises, or after thermal paste degrades.

To disable overclocking, restart your PC and enter the BIOS/UEFI by pressing the appropriate key during startup (commonly Delete, F2, or F10 — check your motherboard manual if unsure). Once inside the BIOS, navigate to the CPU configuration or overclocking section. The exact name varies by motherboard brand: look for “OC Tweaker” (ASRock), “AI Tweaker” (ASUS), “M-Flash / OC” (MSI), or “Easy Tune” (Gigabyte).

Find the option to load optimized defaults or reset CPU settings to stock. Confirm the change, save, and exit. Your system will reboot at factory-rated CPU speeds. If you want to keep overclocking, invest in a better CPU cooler — ideally a 240mm or 360mm all-in-one liquid cooler or a high-performance air cooler like the Noctua NH-D15 — before re-enabling it.

Fix 4: Identify Apps Consuming Excessive CPU Resources

A single misbehaving application can hold your CPU at near-maximum load indefinitely, generating enough heat to trigger the over-temperature error even on a well-cooled system. Windows 11’s Task Manager makes it easy to catch these offenders.

Step 1: Open Task Manager

Right-click the Start button and select Task Manager, or press Ctrl + Shift + Esc. Click the Processes tab if it isn’t already selected, then click the CPU column header to sort processes by CPU usage in descending order. Any process consuming an unusually high percentage at idle — anything above 10–15% when you’re not actively using that application — is a candidate for investigation.

Step 2: End High-Usage Processes

If you spot a process that’s consuming excessive CPU and you don’t recognize it, right-click it and select Search online to look it up before taking action. For processes you know are safe to stop, right-click and choose End task. Keep in mind this is a temporary fix — if the process restarts automatically, you may need to uninstall the associated application, disable it from startup, or investigate further for malware.

⚠ Tip: If Windows Antimalware Executable (MsMpEng.exe) is the culprit, try scheduling Windows Defender scans for off-peak hours or temporarily disabling real-time protection to confirm it’s the source before making permanent changes.

Fix 5: Throttle the Maximum Processor State

Windows 11 allows your CPU to run at 100% of its maximum frequency under load by default. On systems with marginal cooling, limiting this ceiling — say, to 80 or 90% — can meaningfully reduce peak temperatures with only a minimal impact on everyday performance. You configure this through the Advanced Power Options.

Step 1: Open Control Panel

Click the Start button, type Control Panel, and press Enter to open it.

Step 2: Navigate to Power Options

In Control Panel, click Hardware and Sound, then click Power Options.

Step 3: Change Plan Settings

Next to your active power plan, click Change plan settings.

Step 4: Open Advanced Power Settings

On the plan settings page, click Change advanced power settings to open the Power Options dialog.

Steps 5–7: Set Maximum Processor State

In the Power Options dialog, scroll down and expand Processor power management, then expand Maximum processor state. Change the value from 100% to 80% (or another value between 70–95% depending on how aggressively you need to limit heat). Click Apply, then OK. Restart your PC and monitor CPU temperatures to see the improvement.

💡 Pro Tip: Use a free tool like HWiNFO64 or Core Temp to monitor your CPU temperature in real time while stress-testing with Cinebench or Prime95. Aim to keep temperatures below 90°C under full load for Intel CPUs and below 95°C for AMD Ryzen processors.

Fix 6: Install or Roll Back Windows Updates

A buggy Windows update can occasionally cause drivers or system services to behave erratically, pushing CPU usage — and therefore temperatures — higher than normal. Conversely, if you’re running outdated drivers or system files, a pending update may contain thermal management improvements. This fix covers both directions: installing available updates and uninstalling a recent problematic one.

Install Available Windows Updates

Step 1: Open Settings

Press Windows + I to open the Settings app.

Step 2: Go to Windows Update

In the Settings sidebar, click Windows Update.

Step 3: Check for Updates

Click Check for updates. Download and install any available updates, including optional driver updates. Restart your PC when prompted and check whether the CPU temperature error persists.

Uninstall a Recent Windows Update

If the CPU over-temperature error started appearing shortly after a Windows update, that update may be the cause. Here’s how to remove it.

Step 1: View Update History

In the Windows Update page, click Update history to see a list of recently installed updates.

Step 2: Open Uninstall Updates

Scroll to the bottom of the Update history page and click Uninstall updates.

Step 3: Select the Problematic Update

Find the update you want to remove (sort by date to find the most recent ones), then click Uninstall next to it.

Step 4: Confirm Uninstallation

Click Uninstall in the confirmation dialog. Windows will remove the update and restart your PC. After rebooting, verify whether the CPU temperature error has resolved.

Fix 7: Roll Back to a System Restore Point

If none of the software-based fixes above have resolved the issue and you have a system restore point created before the problem started, rolling back to that point can undo any system-level changes that may be contributing to excessive CPU usage. System Restore does not affect your personal files, but it will revert installed programs and system settings to their previous state.

Step 1: Open Control Panel

Click Start, type Control Panel, and press Enter.

Step 2: Go to Recovery

In Control Panel, click System and Security, then click Recovery.

Step 3: Open System Restore

Click Open System Restore to launch the System Restore wizard.

Step 4: Click Next

On the welcome screen of the System Restore wizard, click Next to continue.

Step 5: Select a Restore Point

A list of available restore points will appear with their dates and descriptions. Select a restore point that was created before the CPU over-temperature error started occurring, then click Next.

Step 6: Scan for Affected Programs

Before committing, click Scan for affected programs to see which applications and drivers will be removed or restored by the rollback. Review the list and click Close, then Next when you’re ready to proceed.

Step 7: Finish and Restore

Review the restore point details on the confirmation screen, then click Finish. Click Yes on the final warning dialog. Your PC will restart and begin the restoration process, which typically takes 5–15 minutes. Once complete, Windows will boot normally and display a confirmation message. Check whether the CPU over-temperature error has been resolved.

The CPU over temperature error is your system’s self-protection mechanism at work — it’s alarming, but it’s also a clear signal that something needs attention. In most cases, a thorough cleaning, improved airflow, or a software-side fix like throttling the processor state will resolve the issue entirely. If temperatures remain dangerously high after working through all seven fixes, it’s worth considering a CPU cooler upgrade or consulting a professional technician to check for a failing heatsink mount or damaged thermal interface. A well-cooled CPU runs faster, lasts longer, and gives you one less thing to worry about when you power on your PC.