Legacy Thermador HGSW Hood Flashing LED D: Grease Filter Cleaning Reminder

What Flashing LED D (grease filter saturation) means

On legacy Thermador HGSW wall hoods with mechanical push buttons, a flashing LED D is not an error. After 40 hours of use it reminds you the grease filter needs cleaning. After cleaning, press button A for about 3 seconds until the signal beeps to reset the reminder. Reset the reminder this way. The reminder then starts over.

Usual causes of Flashing LED D (grease filter saturation)

40 hours of use

✓ A safe check worth trying

1. Switch the hood off and let it cool. 2. Remove and clean the grease filter. 3. Reinstall it. 4. Hold button A for about 3 seconds until you hear the beep. If LED D keeps flashing afterward, call us.

! Why you should stop here

This is an owner task.
A failed reset needs a technician.
The price is written if we visit.

Taking off a panel yourself does not by default void a manufacturer warranty, yet it can lead to accidental damage, and some manufacturers attach their own service terms. Read your warranty paperwork, or ask us, before you decide.

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Flashing LED D (grease filter saturation)Flashing LED D (grease filter saturation) questions

Is LED D an error?

No. It is a reminder, after 40 hours of use, that the grease filter is saturated and needs cleaning. Cleaning the filter, then resetting, is all it asks of you.

How do I reset it?

After cleaning the filter, press button A for about 3 seconds until the signal beeps. Keep the button down until you hear it; a quick tap will not reset the reminder. Then check that LED D stays off.

Does this apply to every Thermador hood?

No. The reminder described here is for legacy HGSW wall hoods; newer hoods use other indicators. The source covers only the HGSW model, so we do not apply this to other hoods without checking the manual.