The particle light indictates the air is bad - Blueair 250E Air Purifier

Those devices use a process call IONIZATION to clean the air. What this does is make high voltage that jumps out into the air and attaches to particles in the air. Those particles are now attracted to anything with an opposite charge. In some machines there is a plate that has the opposite charge and a fan that pulls the air into the machine. When particles that are charged come into the machine, they are drawn to that plate and stick. The plate gets dirty pretty fast and has to be cleaned. The problem comes when the ionizer begins to spark. This creates ozone and ozone is harmful to people and animals, rubber and many other things. I looked up the name of the machine that you listed and the closest I can find is a really old reference to a radio shack device. the Environizer™ (630-0612/630-0613) This device was made just after regulation by the federal government that says 50 parts per billion is the limit so that device SHOULD be ok. However it has to be maintained and cared for. There is a great article here:http://www.allergyclean.com/problems-with-ozone-generators-and-ionizers-that-produce-ozone/
Just keep in mind the difference between ozone generators and air ionizers, they are not the same thing. If you need more info let me know.

the foam cover filters the large dust particles and can be washed. It serves to prolong the life of the expensive hepa filter element. Leave it on.

You might try submitting this question here...
https://www.mitsubishielectric-usa.com/contact_us/

I would use hot melt glue to hold everything in place. The air cleaner works by charging the air particle at the front and there is high voltage on the plates. The polarity of the plate alternates where the first plate is positive, the second is negative, the third is positive, forth is negative, etc .
With first wire in front charging the dust particle, the plate attract the charged dust particle to the plate to capture it.

HEPA is a type of air purifier. It stands for high-efficiency particulate air. To qualify as a HEPA filter by government standards the filter must remove 99.7% of all particles larger than 0.3 micrometers from the air. The following site lists the top 10 HEPA purifiers available online - http://www.air-purifiers-america.com/AP101_top10.asp.

If it was just clean recently, it's probably picking up dust particles and that's what you hear or see arching, like a bug zapper.And conversely, if it has been cleaned recently, dust particles on the filter are breaking off and getting zapped. In which case, you need to clean the filter.

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Most particles in the air are neutral in charge. Meaning they have the same amount of negatively charged electrons, and positively charged protons. A common type of air purifier uses what is called corona discharge air purifier. These type of air purifier create molecules called ions. When particles pass through these air purifiers electric current makes these particle either positively charged or negatively charged. Once these "ionized" particles from the air makes contact with objects that are opposite of thier charged, they stick to them instead of lingering in the air, or they may clump with other particle untill they are too heavy and fall to the ground. Filter types air purifier are not so good since they require periodic filter replacement. These type of air purifier are usually part of the air conditioning system. The purifier picture I see are the ones i just mentioned, and they are not filter types.

The unit is designed to drop particulates out of the air. If you have a heavily polluted area there are more allergens/dust in the air and this might create a 'dust-shower'.
The unit charges particles negatively so the particles bond with positively charged particles. Then the particles drop out of the air or stick to a nearby object. This could leave some black stuff on the wall. You can easily wipe this off, most of this is grime/dust.

Dutch

I had the same problem: Had cleaned it inside, taking off both grids, washing wire, etc. Still the red light blinking would come back on after a few minutes. So here's what I did next:

Take off the grids on both sides. Make sure the grids are clean with water and paper towels (lots of black) On the unit itself, wipe out the metal sides and all the plastic. Then, here's the KEY,
get out your computer cleaning canned AIR and blow it into the open unit and blow the air on both of the grids too. I first used a hairdryer to blow it out, but the canned air is much stronger and I got all kinds of little black particles out with it.

Put it up and down 3 times, plugged it back in and WALAA! The unit is back to working perfectly and no red light has come on again!

I'm sure this will work for everyone if you just get the canned air and blow out the unit and the grids too even though you've cleaned them!

You may have a Vacuum Leak, Throttle Position Sensor may be bad, and the MAP Sensor. Those are know to go on the 3.1L Chevy Lumina's. Thank you for using Fix Ya! Don't forget to rate the overall rating of this answer. Good Luck.