Duronic FN55 BK Wandventilator — Error codes & fixes
Troubleshooting guide for the Duronic FN55 BK Wandventilator. Diagnose an error code and find the fix.
Unit not turning on
not-poweringThe purifier does not power on, possibly a power issue or a tripped internal fuse.
Source: YouTube — repair & troubleshooting videos
Confidence: 60%
Verified Aug 9, 2026
Wi-Fi connection failure
wifi-connectThe purifier cannot connect to the app or Wi-Fi, blocking remote control and monitoring.
Source: YouTube — repair & troubleshooting videos
Confidence: 60%
Verified Aug 9, 2026
Red filter light stuck on
red-lightThe filter indicator light stays red even after replacing the filter, often requiring a manual reset.
Source: YouTube — repair & troubleshooting videos
Confidence: 60%
Verified Aug 9, 2026
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