These are the most common Windows and hardware error codes caused by PSU failures — what they mean and how to fix them.
PSU Error Codes & Fixes
| Error Code | What It Means | Fix |
|---|---|---|
| 0x124 – WHEA_UNCORRECTABLE_ERROR | General hardware failure. Often caused by PSU voltage instability. | Check PSU cables, test with another PSU, remove overclock. |
| 0x9C – MACHINE_CHECK_EXCEPTION | CPU detected unstable or incorrect power delivery. | Inspect PSU, check motherboard power connectors, test PSU output. |
| 0x0 – Internal Hardware Error | System encountered a fatal hardware fault (often PSU underload/overload). | Check PSU wattage, test with known-good PSU. |
| 0xA – IRQL_NOT_LESS_OR_EQUAL | Power instability caused device or driver failure. | Check PSU rails, reseat power cables, inspect motherboard. |
| 0xF – Hardware Cache/Bus Error | Unstable power caused CPU/GPU cache corruption. | Remove overclock, check PSU voltage stability. |
| Unexpected Shutdown (Kernel-Power 41) | System lost power unexpectedly — classic PSU failure symptom. | Check PSU, test wall outlet, inspect power cables. |
| Power Surge Detected | Motherboard detected unstable or excessive PSU voltage. | Replace PSU, check surge protector, inspect wiring. |
| PSU Fan Failure Warning | PSU cooling failure — overheating risk. | Replace PSU immediately. |
| 12V Rail Undervoltage | PSU cannot supply stable power to CPU/GPU. | Replace PSU, check power cables, remove GPU overclock. |
| Overcurrent Protection Triggered | PSU shut down due to excessive load. | Check GPU/CPU load, verify PSU wattage is sufficient. |
| PSU Overheat Shutdown | PSU exceeded safe temperature limits. | Improve airflow, clean dust, replace PSU if overheating continues. |