Range Hood Diagnostics
Thermador Range Hood
Thermador Range Hood
Error Codes
Meanings, severity levels, safe checks you can perform, and when to call a technician.
Enter the code shown on your range hood display
Is it safe to keep using it?
Depends on code severity. Low/Medium codes often allow continued use, High severity requires immediate stop.
Can error codes be reset?
Some codes clear after power cycle. Persistent codes indicate underlying issues needing repair.
When should I stop using it?
Stop immediately for water leak codes, burning smell, or any High severity error.
Most Common Codes
Error Code Directory
Click any code for detailed troubleshooting steps
Low
Medium
High
Code
Meaning
Severity
Common Symptom
FAN-FAIL
Fan Motor Not Running
High
Switching through all speed settings — from low through boost on Thermador Professional hoods — produces no movement of air at the grease filter surface.
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FAN-NOISE
Abnormal Fan Noise
Medium
The hood fan produces a pronounced rattle or vibration that was not present when the hood was new, and that seems to get louder at higher fan speeds.
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FILTER-CLEAN
Filter Cleaning Required
Low
A dedicated filter icon or the word FILTER lights up on the Thermador hood control panel, typically after 30 to 40 hours of cumulative fan operation.
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NO-LIGHT
Light System Not Working
Low
The light switch is pressed and no light output is produced over the cooking surface on any of the available brightness levels.
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NO-POWER
Total Power Failure
High
Pressing any control panel button, fan speed, or light switch produces no response and no indication of any kind on the display or panel.
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SWITCH-FAIL
Control Switch Failure
Medium
One button on the Thermador hood control panel — typically a specific fan speed or the light switch — does not activate its function when pressed, while all other buttons work correctly.
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VENT-BLOCK
Ductwork Blockage
Medium
Running the hood at maximum speed and checking the exterior wall or roof cap shows minimal or no air movement outside the home, confirming the duct path is restricted.
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