[HCigar VT75 Nano w/ Crown 2]

Did you run the atomizer analyzer? Also, are you sure you have the correct temperature profile .csv loaded? Sorry if this is too basic of a question, just trying to cover the bases.

Yes, I ran the analyzer. This is happening with two separate tanks/coils. Both tanks/coils work fine on my old Kanger MOD (although that MOD doesn't have the temp protection). I'm using the SS316 temperature profile. 

I had similar problems to you with a Hcigar VT75 and a crown tank. Turned out it was just a loose cathode screw. Was easy to fix and haven't had any problems since. Even have a Crown 2 tank with .25ohm coil and works great. Good luck

I wish I could try this. The VT75 Nano doesn't have a cathode screw in the same place. I don't see one someplace else on the MOD either. A quick search doesn't come up with anything for a cathode screw on the Nano.

[HCigar VT75 Nano w/ Crown 2]

So with ohms locked at .518 (what the atomizer analyzer read), on 44W it's hitting temperature protection about a second into a cold hit. Thus getting a VERY weak hit. Something seems odd. There isn't even enough time for it to heat a coil from room temperature to 450F in a second or two.

[HCigar VT75 Nano w/ Crown 2]

What temperature, and what wattage, is it set at?

44W with a 450F TC limit.

[HCigar VT75 Nano w/ Crown 2]

I haven't used that tank and/or coil, but I've read some reports of folks having trouble with them. That said, how much are the ohms changing by? If you're talking +/- .01 ohms or so, then I wouldn't worry about it. If it's moving a little bit more than that, you could try locking the resistance once you're confident you have a good cold reading. But if it's all over the place, you could have a defective coil. Have you run the atomizer analyzer in escribe? That tool can be helpful in spotting problem coils.

It's bouncing from .52 up to as high as .69. As I stated in my follow-up, it's not just one coil. I tried my original Crown tank too and am getting similar results.

[HCigar VT75 Nano w/ Crown 2]

New symptom, the ohms value keeps changing. Looked like maybe a defective coil but I popped my original Crown on the HCigar and it's behaving the same way. Everything I can find related to changing ohms values seems to point to the coil but it's happening on two different coils.

[HCigar VT75 Nano w/ Crown 2]

I just got the HCigar VT75 Nano with a Crown 2 and I'm having some trouble getting the settings right for the Crown 2 coil. I'm using the .5 Ohm SUS316 coil and with the TC on I keep getting Temperature Protection errors with really weak hits. Does anyone have any advice?