How to reset filter sensor?

It sounds like there may be a problem with the vacuum's sensor that detects when the bag or filter is full. Here are some troubleshooting steps you can try to fix the issue:

1. Check the bag and filter: Make sure that the bag and filter are properly installed and not damaged. If the bag or filter is damaged or not properly installed, it can cause the sensor to malfunction.
2. Reset the sensor: Some Nilfisk vacuums have a reset button or switch that can be used to reset the sensor. Check the owner's manual or the vacuum itself for a reset button or switch and try resetting the sensor.
3. Clean the sensor: Dust and debris can sometimes accumulate on the sensor and cause it to malfunction. To clean the sensor, turn off the vacuum and unplug it from the electrical outlet. Locate the sensor and use a small brush or compressed air to carefully clean it.

If these troubleshooting steps do not resolve the issue, it is possible that the sensor itself is damaged or malfunctioning. In this case, it may be necessary to have the sensor repaired or replaced by a professional.

https://www.youtube.com/watch?v=5Cz5_VyQmLU
Hold down the filter button for 3 seconds to reset the light. Hold the button down until it beeps or the light changes from orange to blue. If the light doesn't turn blue, check that you are holding down the button rather than the lit-up icon. Reset your French door bottom mount fridge with the touchpad.
https://www.wikihow.com/Reset-a-Water-Filter-Light-on-a-Whirlpool-Refrigerator

Take it back apart and carefully reassemble it, you likely misplaced one of the components causing air bypass or not triggering an internal switch.

Is the filter you washed dry? That may affect the way it senses things.

Thank you for your inquiry, John Sodt!
From what you have described your Frigidaire refrigerator's filter display is not changing back to green after the filter has been changed. This could be a miscommunication within the control panel and to clear out any miscommunications I would suggest performing a reset on your refrigerator. The best way to reset your refrigerator is to unplug the power cord for roughly ten minutes. If that does not help your issue you may want to speak with a professional technician. Good luck. -Matt

Remove the front cover and locate the FILTER RESET button above the dust sensor level indicator lights. Press and hold this button for 3 seconds until the unit emits a beep and the REPLACE FILTER light goes out.

Hold the light and lock buttons in for about 20 seconds to reset the filter indicator .

not sure if there is a reset button if not

I would say if the filter was bad enough some of the foreign materials (particles the filter should capture) may have went on down the line.

the "clean filter" indicator is most likely activated by the volume of flow. So when the filter is full the flow is reduced in turn the "clean filter" comes on.

so if filter has been replaced and there is no reset button try backflushing the lines. If the lines have built up blockage your flow will stay low and the "clean filter" will stay on.

on these lines there may be bends and turns most likely to have build up in these areas restricting your flow

clean lines (low air pressure may work easiest)

There is a way to re-set the filter light. You usually need to push in two buttons together or one button for a number of seconds. Look for something that has a filter reset indicator or button on the fridge.

Afer you change the filter and have run the water for about 1 minute you then hold down the light & lock button together and this should turn the change filter light off.