Will not operate, no reaction when power button pressed. All panels properly locked.

Lancaster air purifiers can have different models and designs, so the exact location and method for removing the filter may vary. However, I can provide you with some general guidance that should help you locate and remove the filter in most air purifiers.
1. Check the user manual: The first step is to consult the user manual that came with the air purifier. It typically contains specific instructions on how to access and replace the filter. If you don't have the manual, you can often find it online on the manufacturer's website.
2. Look for a filter compartment: Most air purifiers have a designated compartment or access panel where the filter is located. It may be on the back, side, or front of the unit. Examine the air purifier and look for any labeled panels or compartments that indicate the filter's location.
3. Remove the filter cover: Once you've located the filter compartment, you'll need to remove the cover or panel to access the filter. The cover may be secured with screws, clips, or latches. Use a screwdriver or your hands to undo the fasteners and carefully remove the cover.
4. Take out the filter: After removing the cover, you should see the filter inside. Depending on the model, the filter may be a single unit or consist of multiple layers. Take note of how the filter is positioned before removing it to ensure you can correctly replace it later.
5. Follow any additional instructions: Some air purifiers have specific instructions for removing the filter, such as pressing a release button or sliding it out from a designated slot. Refer to the user manual or any labels on the unit for any additional guidance.
6. Clean or replace the filter: Once the filter is removed, you can determine whether it needs cleaning or replacement. If it's a reusable filter, check the manufacturer's instructions on how to clean it properly. For disposable filters, it's generally recommended to replace them according to the manufacturer's guidelines.
Remember to consult the specific user manual for your Lancaster air purifier model to get accurate instructions tailored to your device.

Filter Replacement
Filter Replacement Indicator:
Your Defender® is equipped with a Filter Replacement Indicator located on the front
panel. Anytime this red indicator flashes, it is recommended that you call your authorized
FILTERQUEEN® Distributor to order a replacement filter. Anytime this red indicator stops
flashing and remains solidly illuminated, it is recommended that you change your filter. To
receive full benefit from your Defender® and to extend your warranty, it is strongly
recommended that you follow the filter replacement schedule suggested above. Under higher
pollution levels, your filters will need to be replaced more frequently.
The Filter Replacement Indicator is operated by filter time in use and is controlled by an
onboard timer. After 11 months of time in use of your Medi-Filter® Cartridge, the Filter
Replacement Indicator will begin to flash. It will continue to flash until the you reach 12
months of time in use, at which time the Filter Replacement Indicator will stop flashing
and remain solidly illuminated.
After replacement of your Medi-Filter® Cartridge, you must reset the Filter
Replacement Indicator's timer. When the timer has been properly reset, the Filter
Replacement Indicator will turn off.
Resetting the Filter Replacement Indicator Timer:
After replacement of your Medi-Filter® Cartridge per the instructions found on page 7, the
Filter Replacement Indicator's timer can be reset by performing the following sequence of
steps:
1 Plug unit into outlet.
2 Press power On/Off switch to the On ("I") position.
3 Allow unit to start running at low speed.
4 PRESS and HOLD both the Up and Down arrow buttons until the Filter
Replacement Indicator starts to blink.
5 Release both the Up and Down arrow buttons.
6 While the Filter Replacement Indicator is still flashing*, again PRESS and
HOLD both the Up and Down arrow buttons until the Filter Replacement
Indicator turns off.
If the steps above have been performed properly, the Filter Replacement Indicator will
turn off and not flash again for 11 months. If the Filter Replacement Indicator remains
on, repeat the steps again.
*Note that in step 6 above, the Filter Replacement Indicator MUST still be flashing when
the buttons are pressed the second time. The Filter Replacement Indicator will continue
to flash for approximately 3 seconds after the buttons are released as required in step 5 above.
Note: Under higher pollution levels, your filters will need to be replaced more frequently.
Note: To order replacement filters, call your authorized FILTERQUEEN® Distributor, or call
1-440-846-7800 for the Distributor nearest you.

http://www.filterqueen.com/pdf/defender.pdf

1. Plug unit into outlet. 2. Press power ON/OFF switch to the ON position. 3. Allow unit to start running at low speed. 4. PRESS and HOLD both the UP and DOWN arrow buttons until the FILTER REPLACEMENT INDICATOR starts to blink. 5. Release both the UP and DOWN arrow buttons. 6. While the FILTER REPLACEMENT INDICATOR is still flashing, again PRESS and HOLD both the UP and DOWN arrow buttons untile the FILTER REPLACEMENT INDICATOR turns off.
If the steps above have been performed properly, the Filter Replacement Indicator will turn offand not flash again for 11 months. If the Filter Replacement Indicator remains on, repeat the steps again.
*Note that in step 6 above, the Filter Replacement Indicator MUST still be flashing when the buttons are pressed the second time.The Filter Replacement Indicator will continue to flash for approximately 3 seconds after the buttons are released as required in step 5 above.

1. Plug unit into outlet. 2. Press power ON/OFF switch to the ON position. 3. Allow unit to start running at low speed. 4. PRESS and HOLD both the UP and DOWN arrow buttons until the FILTER REPLACEMENT INDICATOR starts to blink. 5. Release both the UP and DOWN arrow buttons. 6. While the FILTER REPLACEMENT INDICATOR is still flashing, again PRESS and HOLD both the UP and DOWN arrow buttons untile the FILTER REPLACEMENT INDICATOR turns off.
If the steps above have been performed properly, the Filter Replacement Indicator will turn offand not flash again for 11 months. If the Filter Replacement Indicator remains on, repeat the steps again.
*Note that in step 6 above, the Filter Replacement Indicator MUST still be flashing when the buttons are pressed the second time.The Filter Replacement Indicator will continue to flash for approximately 3 seconds after the buttons are released as required in step 5 above.

1. Plug unit into outlet. 2. Press power ON/OFF switch to the ON position. 3. Allow unit to start running at low speed. 4. PRESS and HOLD both the UP and DOWN arrow buttons until the FILTER REPLACEMENT INDICATOR starts to blink. 5. Release both the UP and DOWN arrow buttons. 6. While the FILTER REPLACEMENT INDICATOR is still flashing, again PRESS and HOLD both the UP and DOWN arrow buttons untile the FILTER REPLACEMENT INDICATOR turns off.

If the steps above have been performed properly, the Filter Replacement Indicator will turn offand not flash again for 11 months. If the Filter Replacement Indicator remains on, repeat the steps again.
*Note that in step 6 above, the Filter Replacement Indicator MUST still be flashing when the buttons are pressed the second time.The Filter Replacement Indicator will continue to flash for approximately 3 seconds after the buttons are released as required in step 5 above.

1. Plug unit into outlet. 2. Press power ON/OFF switch to the ON position. 3. Allow unit to start running at low speed. 4. PRESS and HOLD both the UP and DOWN arrow buttons until the FILTER REPLACEMENT INDICATOR starts to blink. 5. Release both the UP and DOWN arrow buttons. 6. While the FILTER REPLACEMENT INDICATOR is still flashing, again PRESS and HOLD both the UP and DOWN arrow buttons untile the FILTER REPLACEMENT INDICATOR turns off.

If the steps above have been performed properly, the Filter Replacement Indicator will turn offand not flash again for 11 months. If the Filter Replacement Indicator remains on, repeat the steps again.
*Note that in step 6 above, the Filter Replacement Indicator MUST still be flashing when the buttons are pressed the second time.The Filter Replacement Indicator will continue to flash for approximately 3 seconds after the buttons are released as required in step 5 above.

It won't go out by itself.
1. Plug unit into outlet. 2. Press power ON/OFF switch to the ON position. 3. Allow unit to start running at low speed. 4. PRESS and HOLD both the UP and DOWN arrow buttons until the FILTER REPLACEMENT INDICATOR starts to blink. 5. Release both the UP and DOWN arrow buttons. 6. While the FILTER REPLACEMENT INDICATOR is still flashing, again PRESS and HOLD both the UP and DOWN arrow buttons untile the FILTER REPLACEMENT INDICATOR turns off.

If the steps above have been performed properly, the Filter Replacement Indicator will turn offand not flash again for 11 months. If the Filter Replacement Indicator remains on, repeat the steps again.
*Note that in step 6 above, the Filter Replacement Indicator MUST still be flashing when the buttons are pressed the second time.The Filter Replacement Indicator will continue to flash for approximately 3 seconds after the buttons are released as required in step 5 above.

The blue means the germicidal lamp is operating. Re: green light - Normal operation at all power levels involves a pre-programmed cycle of altering high and low air movement. Press the the green to override the regular power control setting and run the unit at maximum power for five minutes. Your previously selected power level will resume after the five minutes has elapsed.

I have a Bionaire tower air filter model BAP1700 that I bought from Costco. The filter check LED came on recently after 5 months of use. After cleaning the Permatech filters, I tried every remedy on this website including following the instructions that say push power button for 2 secs. Nothing worked. Then I noticed a tiny hole on the control panel in front of clean filter LED; I pushed a paper clip pin into that hole, felt a click, held it down and 2 secs later, LED went out. Success!

When the red light is blinking, press and hold both up and down arrows until the red light blinks RAPIDLY, release both for a second or two, and press and hold both again until it stops blinking. It cured my problem.