Desktop CPU Cooling System: fan control circuit fault. The motherboard cannot command or sense fan speed correctly.

The distinguishing clue

The fan runs at full speed constantly or reports an error despite spinning.

Checks before an assessment

Note whether temperature rises quickly after startup or only under sustained CPU work. Keep the case closed and avoid load tests if the cooler may be loose or the pump has stopped.

Stop point: A loose cooler can allow unsafe temperature rise within seconds.

Workshop confirmation and repair

Device-level check: Compare pump or fan speed, cooler mounting, case airflow and processor power under a controlled test.

Targeted check: Compare temperature, command and tachometer behaviour. If confirmed: Repair the controller or sensing path after testing a known fan.

Repair boundary: Repair the confirmed fan, pump, mounting, compound or airflow fault before extended load.

Related cause to rule out

When fan speed rises but exhaust airflow remains weak, also consider Desktop CPU Cooling System: dust blockage before choosing a repair.

Checks after the work

After repair or replacement, check idle, processor stress, fan or pump speed and cooldown.

For an AEPC repair assessment in East Auckland, provide the exact model and observed clue. Call 027 908 8880 before visiting the Burswood workshop.