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By changing the Collector Cell. The flashing light is an indication that it needs cleaning. Here is a link to model you listed above. It has all the information you need, on how to clean the Collector Cell. You can download and print it for future reference.
I have two Quadras not sure about the GPS. The only way to clean them properly is to complete the folowing steps. This will eliminate the hissing noises and intermittent shutdowns. Clean the blade unit as normal and leave it out of the unit. Unplug the unit, remove the four phillip screws on the top of the unit where the collector grid slides down. Next remove the four screws holding on to the base of the unit. After this you will see two additional screws also by the base that need to be removed. Look carefully between the grills of the unit and you will see about 12 to fifteen tiny screws that hold the grill together. After these are removed take off the UL label and seprate the grill. You may have to gently pull up on the top where the power switch is located. I have found if you use a lightly dampened scotch brite pad to carefully clean the two wires works best. Clean the wires and pins at the bottom and make sure all is well. Use a microfiber or lint free cloth to gently wipe everthing down and make sure the unit is dry. Put it back together and put the UL sticker back on.
We purchased one of these in April 2009. Same issue appeared with us. Cleaned the cell and the "clean collector cell" still stayed illuminated. Checked the manual and the trouble shooting section stated to hold down the "air revitalizer button" till the "clean collector cell" light blinks three times. After this operation the light went out and all was fine!!!! Hopes this clears your issue!
The only cartridge is the included 'stainless steel collector grid' (removable for cleaning with cloth, don't use vinegar), there's no air filters that need replacing.
According to the manual:
SIR setting (Super Ionic release) creates lots of negative ions which not only gives a prior-to-rainy-day fresh energetic atmosphere that relieves headaches, but also if comes into contact with dust, will attach to the dust and make them heavier to drop them out of the air. SOS setting (Super Oxidating Sanitizer) turns oxygen O2 molecules to O3
molecules, which if comes into contact with odor or dust will discharge
1 O atom into the pollutant to neutralize it. Also, like SIR, it introduces negative ions that attach to dust and makes them fall to ground, but not as much,
Both settings tackle dust/pollen/smoke with SIR doing it faster. Only SOS can neutralize organic odors. I recommend SOS because if you leave it on long enough it can do the same job as SIR, as well as make the room smell fresh.
Did you find an answer to your orange light question? I have an AM4000 defender that I bought off Craigslist and thought I got a good deal on it. One minute after turning it on the red light came on. I tried to reset it but the red light won't flash so you can't reset it. I don't know if it's a filter problem or a circuit board problem and I don't want to spend $100 bucks on filters to find out it's a different problem. If you buy filters on e-bay, they're cheaper but if you spend $100 from a distributor then you reactivate the warranty. I'm sorry I bought it.