Yeah I clean and reuse coils all the time when I switch flavors. I use Smirnoff red label vodka to clean mine. It works great and I get a couple shots while doing it. I let them soak for a while then swish them around in the cup then remove and let dry overnight while I vape a coil I have already cleaned. So 2 coils can last a long time.
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"check atomizer" is a simple way of saying it detects a resistance higher than it's maximum or it is simply not making a "complete circuit". It could mean many things, but here's a few to check out.
Start with the easiest first... if you have a different coil, put that in. Don't worry about putting juice in at first, just see if the coil works. if two (or more) coils aren't working, then it's probably not the coil's issue.
Second, check the mod's 510 and the atomizer's 510 as well. make sure they're both clean and full of debris. make sure the center pin on the atomizer is not recessed in.
third, try another atomizer. If you don't have one, go to a vape shop and see if you can borrow one just to see if that works. This determines if it's the mod's not working. If it doesn't work with a known good atomizer, then there's something wrong with the mod itself. Check to see if the center pin is not pushed down too far.
the worst possible problem is a faulty 510 connection on the mod. I have had a few mods where the 510 connector became defective. The wire broke from the center part of the 510. It would require me to open the mod and re-soldier the connection.
I hope that helps. Usually a local vape shop will determine what's wrong. hope everything works out for you.