RDA Derringer and iStick No Atomizer

[Twicehorn]

Ok, so a few days ago, I got a praxis Derringer rda. I've been using it on my iStick in a single coil configuration with 8 turns of 28ga. Gives about 1.3-1.4 Ohm.

So for the first couple days, completely trouble free, enjoying it. However, as the coil got crudded up, the resistance measured by the iStick and a Vamo started to vary quite a bit, from 1.x to 4.x etc. Worse, with the iStick, I am frequently getting the "no atomizer" warning, right in the middle of a vape session. Pretty often after pulling the drip tip and dripping juice (perhaps pulling it off the centerpin?)

WIth my Russian 91 I would often observe pretty wildly varying resistance and would on occasion get the "no atomizer" out of the blue.

Aspires always work no problem and I have even used the adapter for the Aspires with the Derringer and still get no atomizer. I have pulled the centerpin and am very ginger tightening the RDA on the threads.

What the heck is going on?

 

[edyle]

My guess is it's exactly what you've been thinking - centerpin contact issues.

 

[Kprthevapr]

Make sure you don't have any juice leaking down in the top cap, that can cause issues too

 

[Das Auto]

Try not to pull so hard on the top cap when removing OR twist and pull (twisting in the direction to tighten it down!).

 

[mcclintock]

You may have contact issues between the wire and the post. I get little explosions sometimes when the contact resistance is enough to boil the juice in the post hole and it kind of pops out of there. When I tried 32 gauge wire, dual coil, sometime neither would be working until pop-pop.

I haven't used that battery, but voltage control mode should produce a stable output even when contact is intermittent. In variable watts, if the circuit is open it needs to output infinite voltage.

 

[Dougiestyle]

Check the post screws to be sure they are tight. Sometimes rda screws back off.

 

[Twicehorn]

Thanks for all the responses. I got grumpy and decided to replace the coil. I had checked screw tightness. But when I pulled the coil off, I noticed some burnt material on the post where the wire goes in. I rubbed that off, turned the coil around (swapping wires and posts) and re-tightened. I have been vaping some stuff that really cruds up coils and apparently it got the post too and kludged up the contact. Anyway, cleaning it up a little solved the problems.