Synology NAS Error Code 36: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
36
Brand
Synology
Product Type
nas
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Synology DSM Error Code 36 means your NAS device has detected that one or more of its internal cooling fans are spinning too slowly or have stopped entirely. This is a medium-severity warning because insufficient airflow can cause your NAS to overheat, potentially damaging drives, the CPU, or the motherboard. Acting quickly to diagnose and resolve the fan issue will protect your data and hardware.
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Tools You'll Need

How to Fix Error Code 36

  1. Check DSM Notifications and System Health

  2. Monitor Current Fan Speed and Temperature

    If system temperature is critically high (above 70°C), power down the NAS immediately to prevent hardware damage before proceeding with physical inspection.

  3. Power Down and Physically Inspect the Fan

    Always unplug the NAS from the power outlet before opening the chassis. Wait at least 30 seconds after shutdown before touching internal components to allow capacitors to discharge.

  4. Clean the Fan and Vents

    Do not use a vacuum cleaner directly on internal components as static discharge can damage sensitive electronics. Use only compressed air or an anti-static brush.

  5. Check and Reseat the Fan Power Connector

  6. Power On and Test Fan Operation

  7. Adjust Fan Speed Settings in DSM

  8. Update DSM Firmware

    Back up your NAS configuration and critical data before performing a firmware update. While rare, firmware updates can occasionally cause issues if interrupted.

  9. Replace the Faulty Fan

    Use a replacement fan that matches the original fan's dimensions and connector type. Installing an incompatible fan may not be recognized by DSM or may not fit properly in the chassis.

Parts You May Need

Replacement cooling fan
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Compressed air canister
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Replacement cooling fan
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Compressed air canister
Check Price on Amazon
Replacement cooling fan
Check Price on Amazon
Compressed air canister
Check Price on Amazon
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When to Call a Professional

Contact Synology support or a qualified NAS technician if: the replacement fan still triggers Error Code 36 after installation, the NAS is under active warranty (opening the chassis yourself may void it — check Synology's warranty terms), temperatures remain critically high even after fan replacement, or you see signs of physical damage to the motherboard or other internal components such as burn marks or bulging capacitors. Synology's official support portal can also run remote diagnostics on your unit.

Frequently Asked Questions

What does Synology Error Code 36 mean?
Synology DSM Error Code 36 means the system has detected that one or more internal cooling fans are running at a speed lower than the expected minimum threshold. This could be due to a failed fan, dust blockage, a loose power connector, or a firmware issue.
Will Synology Error Code 36 cause data loss?
Error Code 36 itself does not directly cause data loss, but if left unresolved it can lead to overheating. Excessive heat can cause hard drives to fail prematurely or the NAS hardware to malfunction, which could result in data loss. Address the error promptly to protect your data.
Can I still use my Synology NAS while Error Code 36 is showing?
Short-term use is possible, but it is not recommended to continue running the NAS unaddressed, especially in a warm environment. Monitor the system temperature closely in DSM. If temperatures are approaching or exceeding 60°C for drives or 70°C for the CPU, power down immediately and resolve the fan issue first.
How do I check the fan RPM on my Synology NAS?
Log into DSM and go to Control Panel > Hardware & Power. Depending on your DSM version, there may be a fan speed or thermal management section. You can also check the Resource Monitor or Storage Manager > Overview for hardware health indicators that include current fan speeds.
What size replacement fan does my Synology NAS need?
Fan size varies by Synology model. Common sizes include 60mm, 80mm, and 92mm. Check your specific NAS model's documentation on Synology's website, or physically measure the existing fan after removal. Match the dimensions and connector type exactly to ensure compatibility with DSM fan speed monitoring.

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