Viking Designer Cooktop Code FL: Keyboard Error From Ambient Light

What FL means

On Viking Designer DETU series touch-control radiant cooktops, FL is a keyboard error tied to ambient light. Heat to every zone stops, and the code stays on the timer display. Because the error is tied to ambient light, strong light on the panel or a dirty panel is worth ruling out. A control that keeps showing FL in normal light needs a technician.

Common causes of FL

Strong light shining on the touch panel
Dirty or filmed touch panel
Keyboard line reporting wrongly to the control

✓ One safe check you can try

1. Turn all controls off and let the glass cool. 2. Shade the panel from direct sunlight or a strong lamp. 3. Clean the panel with a dry, soft cloth. 4. Power the cooktop down at the breaker for a minute, then up again. 5. If FL returns in normal light, call us.

! Why to stop there

The keyboard circuit lies beneath the glass
Light conditions are easy to check, circuits are not
Replacement requires removing the panel

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Cooktop codes

5 flashes (with brief interval)Viking Induction Cooktop Code 5 flashes (with brief interval): Power Device Temperature Sensor FEViking Designer Cooktop Code FE: Temperature Sensor Has Failed 6Viking Induction Cooktop Code 6: filter board error FHViking Designer Cooktop Code FH: EEPROM Control Error on the Board 6 flashes (with brief interval)Viking Rangetop and Cooktop Code 6 flashes (with brief interval): Coil Temperature Sensor Trouble FJViking Designer Cooktop Code FJ: Key Error on the Touch Control 7Viking Induction Cooktop Code 7: voltage supply missing a leg FOViking Designer Cooktop Code FO: Software Error in the Control

FLFL questions

Can sunlight really cause FL?

The keyboard error is tied to ambient light, so strong light on the panel can confuse it. Shade the panel and try again before assuming a part has failed.

How is FL different from FA?

FA is a key error. FL is a keyboard error related to ambient light. Both stop heating, but the repairs can differ. If you tell us the room lighting conditions, it helps us decide where to start.

What if the light is normal?

Then the keyboard circuit may be failing. We test it, quote the price in writing and cover the repair for 30 days. The panel and keyboard circuit are replaced as needed, with a written price first.