Processor · critical

How to fixWHEA_UNCORRECTABLE_ERROR

WHEA uncorrectable error

What this error means

Windows recorded a fatal hardware error through WHEA (stop code 0x124). The hardware error record is needed to narrow down which part reported it.

Applies to
Windows 11; Windows 10 interfaces may differ
Difficulty
Intermediate
Before changes
Some checks require restart or system changes

Documentation checked: 2026-09-28 · Editorial guide checked against the linked documentation; not tested on every hardware configuration.

Before you begin

Back up important files. Save your work and record the exact message before changing anything. If Windows cannot start, see the startup guide.

Work through these checks

0 of 4 complete
01Record the conditions
  1. Note whether the crash occurs under load, while idle, or during startup.
  2. Record recent hardware and performance-setting changes before making another change.
What to expect

You have a timeline to compare with the hardware error.

If it does not help

If it crashes before Windows is usable, collect the stop-code photo and seek startup or hardware support.

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02Check cooling and undo your overclock
  1. Check for blocked vents and non-working fans without opening powered equipment.
  2. If you enabled an overclock, use the manufacturer’s instructions to restore those settings.
What to expect

Thermal or tuning-related instability can be separated from a persistent fault.

If it does not help

If crashes continue at documented settings, avoid increasing voltage or repeatedly stress-testing the system.

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03Use model-specific diagnostics
  1. Identify your PC or motherboard model.
  2. Use its manufacturer’s diagnostic procedure, including memory diagnostics where appropriate. Save work before a restart-based test.
What to expect

A reported diagnostic failure gives a more specific lead.

If it does not help

A passed test does not rule out intermittent hardware faults; retain the report.

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04Escalate with the WHEA evidence
  1. Provide the exact code, timing, model information and diagnostic results to support.
  2. Ask for analysis of the WHEA record or crash dump before deciding which part to replace.
What to expect

A technician can inspect the error source.

If it does not help

Do not perform a generic BIOS flash without model-specific instructions and a stable power supply.

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Possible causes

  • CPU overheating
  • Unstable Vcore voltage
  • Overclocking beyond limits
  • Defective RAM

Sources & further reading