Also... it's IMPERATIVE that the coil is very firmly threaded into the base (almost as tight as U can get it). Put a couple drops on top of coil, in center to prime & 1-2 into each juice port. Re-assemble pretty darn snugly, then with the coin or whatever.. give it one final nudge. Don't ever OVER-fill.... taking it only to where the glass ends, at MOST. Once assembled & right side up, I, personally... cover the airhole on the bottom with my finger & take what's called a primer pull (fast, sharp draw without firing) to re-establish the vacuum pressure inside. It also pulls just a little liquid into the coil itself, to ensure the liquid HAS actually reached to the center of all that cotton. Starting LOW, in wattage.. take a really long inhale, while (every second or 2) pressing & releasing fire button. You might not see any or much vapor, but what that does is.... PULSE the coils (just as one does every time with any coil they put on a dripper!) Gets the coil glowing evenly so there are NO hot spots, NO dry areas OR pools of liquid either.... helps avoid sputtering, spitting, spit-back, popping..... furthermore, gurgling, flooding OR leaking! Do that once or twice then move up in 5-10w steps until you land wherever it ends up tasting best, to you! Breaking in any new coil before using for the 1st time is a great way to get good performance, fully saturated, flavorful vapes... that feed/wick well & burn evenly.. it'll get you the longest life from them, too! IF all is tightly installed & assembled... & you've done all that & still getting 999 or ? Return if the warranty isn't up. IF it is, thankfully the device is adjustable & just raise or lower the wattage.... to taste. It'll still work, just not as an ohm reader. Be sure Ni200 coils are ONLY used in TC-Ni mode... the others in wattage mode.. & enjoy! Hope that helps someone struggling. You might get a tiny bit of condensation coming out of the bottom, it's due to the placement of the airhole (not the best design). I leave it upright & get NO leaking otherwise.. you shouldn't either.
Live long(ER) & vape on!