QNAP NAS Error Code 25: How to Fix High System Temperature

Easy 15-30 minutes High Severity Verified June 2026
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Error Code
25
Brand
QNAP
Product Type
nas
Severity
High
DIY Difficulty
Easy
Estimated Fix Time
15-30 minutes
Error code 25 on your QNAP NAS indicates that the system temperature is too high. This can lead to performance throttling or shutdown to prevent damage. Follow these steps to reduce temperature and restore normal operation.
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Tools You'll Need

How to Fix Error Code 25

  1. Check Ambient Temperature and Ventilation

  2. Clean Dust from Vents and Fans

    Unplug the NAS before cleaning to avoid electric shock or damage.

  3. Check System Fan Operation

    Do not obstruct fans with tools or fingers during operation.

  4. Verify Hard Drive Temperatures

    Back up all critical data before replacing any hard drive.

  5. Update QTS and BIOS

    Back up your NAS configuration before updating firmware.

  6. Reduce Workload and Power Settings

Parts You May Need

Replacement system fan
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NAS-rated hard drive (e.g., WD Red, Seagate IronWolf)
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Replacement system fan
Check Price on Amazon
NAS-rated hard drive (e.g., WD Red, Seagate IronWolf)
Check Price on Amazon
Replacement system fan
Check Price on Amazon
NAS-rated hard drive (e.g., WD Red, Seagate IronWolf)
Check Price on Amazon
Replacement system fan
Check Price on Amazon
NAS-rated hard drive (e.g., WD Red, Seagate IronWolf)
Check Price on Amazon
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When to Call a Professional

If after cleaning, adjusting ventilation, and replacing faulty fans the error persists, contact QNAP support or a professional IT technician. The issue may be a failing motherboard, power supply, or other internal component requiring diagnosis and repair.

Frequently Asked Questions

What does QNAP error code 25 mean?
Error code 25 indicates the system temperature has exceeded safe levels. The NAS may throttle performance or shut down to prevent damage.
Can high temperature damage my QNAP NAS?
Yes, prolonged high temperatures can shorten the lifespan of components, especially hard drives and the motherboard. Immediate action is recommended.
How do I check the temperature on my QNAP?
In QTS, go to Main Menu > System Settings > Hardware > System Temperature. You can also view hard drive temperatures in Storage & Snapshots > Disks > Drive Health.
How often should I clean my QNAP NAS fans?
Depending on environment, clean every 3-6 months. In dusty areas, clean more frequently to maintain airflow.
What replacement fan works with my QNAP?
Use a fan specifically designed for your QNAP model, typically 80mm or 120mm. Check QNAP's compatibility list or contact support.

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