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I've had a 300w Thinkvape Finder 250C for about two years after my Realeaux died as I wanted a high watt triple mod.
Actually hated the 250C layout, the screen, the changes to escribe that came with it, gave up on it several times but then my other DNAs went pop-pop-pop like ducks in a row. So its in use again and it keeps giving hot hits.
I haven't singed this many wicks since I started vaping1sm056pullhair
For what ever reason the board keeps asking new/old coil, atomizer analyser has shown ALL coils on all to be stable to 0.001 although there is a lot of variation over the full depth of the 510 when screwing down an atomiser.
However....in device monitor the resistance drops on firing...hence the constant new/old coil? Thought it would have been within 25% coil recognition?
Sounds like an atty internal connection issue, I get them after about 6 months to a year of use. Cooked juice and other verdigris in the threads between all the metal bits of the atty, and or it can be earth connection from board to mod body that has degraded, normally loosening and tightening a few times fixes that.
For the first I believe the as soon as you put vaping current through it it bridges the gunk and effectively has a lower resistance than when the tiny current for monitoring res is applied. In the past I have told people this and they swear the atty is clean and all the connections are tight, I've been there they are tight and it looks clean. Never underestimate how much hidden gunk gets in there over time and every time I get the symptoms you describe it is one of these reasons. The last one that did this to me was a SXK VapeShell, it took several goes, 3 I think, believing I had got it clean each time, I started with a full strip down though in the end it was cleaning the coil screw holes with a pipe-cleaner and IPA was the detail I missed the first couple of times.
If you are not using temp limiting it would be fine in wattage mode as that does not rely on any resistance measurement.