FAQ: DNA 250 Usage & Troubleshooting
The following was provided by Moderators on Evolv Forum
Common Troubleshooting Steps
Screen is blank, but device functions:
- Verify that it is not in stealth mode: Lock the device and hold power and down until “Normal Mode” is displayed.
- Verify that screen is not pinched by the fire button, if so, return to manufacture for service.
Escribe - Help -About EScribe click the logo 7 times then open Device
Monitor and look at the screen disconnects. If that is > 0 it is a
screen connection issue, could be the cable has come out of the socket
or the cable is damaged.
Device powers on only when connected to USB power:
- Fuse is blown: Visually inspect fuse or test with ohmmeter. Return for repair if blown.
is dead or low or a single cell is dead or low: View cell charge
levels in Escribe to verify that the device sees a three cell pack and
that each cell is charged above 2.00 volts
Battery Meter is inaccurate/Battery % Jumps Down:
setting in Escribe is incorrect. Calculate Watt Hours using battery
analyzer and enough coil wire to form several large loops to dissipate
the heat. The pack you are using likely has less watt-hours than
Weak Battery displayed when battery has sufficient charge:
- Launch Device Monitor and view each cell’s charge level for sagging during vape.
- Verify watt-hour setting for your Lithium Polymer pack is set correctly.
Battery won’t charge to 100%:
the watt hour calculator to guess at a figure will at times result in a
number that is actually in excess of the real life figure for the
pack. Run battery analyzer to get a correct figure or simply reduce the
Warranty Service Error Message:
error means that the logic voltage regulator is running out of spec.
That could be due to a soft short circuit somewhere in the logic
circuitry, a total battery voltage under 4v, or similar. Verify cell
voltages and replace battery if needed or send mod in for service if the
battery is to spec.
EEPROM Programing/Read Failed:
attempted to write/read to/from the device but failed. Typically
related to a poor USB cable or a computer with considerable lag, causing
slow USB response. Use a known good cable, eliminate running processes
and manually try a firmware update via Tools and “Update Firmware”.
Device won’t connect to Escribe:
USB cable – half of the diagnosed connection issues can be traced back
to a poor quality cable or one lacking the wires for data (a cable sold
for cellular device charging).
caused by a short from the “OUT” connection to the atomizer and board
ground (due to poor soldering or erosion of board coating).
Ohms showing 0.00 with new atomizer:
- Ohms will display 0.00 until the fire button is depressed with a new atomizer.
Resistance is variable and results in poor vape:
ground path is crucial. Some mods (like the Hana) did not install a
ground path and relied on the 510 connection to the case which could be
unreliable. Install a dedicated ground connection to the board.
atomizers are poorly suited to vaping in TC mode. They have springs or
loosely threaded center pins that can cause big swings in resistance.
You can fix some of this by unscrewing the pin, cleaning it and then
re-installing and potentially leaving more exposed so there is more
pressure on the 510. You can also increase the pressure of the 510
Temperature Control Not Working:
- See the variable resistance issue.
Once Cell of the Three Cell Pack fails to Charge:
is a rare board assembly error where one of the four resistors near the
USB plug will be omitted or poorly attached. This can be seen with a
visual inspection. If one of them is missing or not installed
correctly, RMA the board.
- If the board is functioning and the onboard resistors look intact, then one cell of the pack may be bad.
The mod will not charge and cell voltages read low:
The custom fields I chose to display while charging do not display:
device will not charge cells below 2 volts. To try and recover an over
drained pack, in Escribe select Device Monitor, Diagnostics, Advanced
and “Perform USB Recovery Charging”. You may need to do this multiple
the screen brightness is greater than 0% for charging in Escribe, they
only display when in idle about 30 seconds after connecting the cable.
USB port gets hot while charging:
Device will not fully charge:
- Check for blown fuse by looking at battery voltage in Escribe or general mod operation.
USB Recovery Charge Fails:
- Verify you have the right battery type selected. If using a Lipo pack, but lipo4 is selected it will only charge partially.
What initial setup items are essential?:
- USB recovery charge only works for cells that are above 1 volt
- USB recovery charge will not work if the mod internal temperature is over 130F
- USB recovery charge may need to be run multiple times
- The pack may not be recoverable
main things it to do: connect to Escribe update the firmware, check the
battery Wh are correct, increase the max Kanthal watts if required,
choose between "max puffs" and "max recharges" battery options, set the
charge screen brightness above 0% and put USB current in one of the
custom fields so you can see if you have used a 1 A USB supply to
Why is my VT200 battery meter dropping so fast?:
of the packs shipped with this mod have less than the advertised 14.43
watt hours. One users tested theirs to be 10.7 watt hours. Putting 11
in the pack rating will result in a more accurate batter meter. It is
also suggested you test your pack with the battery analyzer tool.
I can't get over 100w:
- There is a non-TC limit of 100w as the default in Escribe. You can set it higher if needed.
I am having issues with Stainless Steel:
steel is an alloy and has issues being used as a TC control wire. At a
minimum start with a good TC atomizer and a known mod resistance. Read
this great write up by James
Escribe won't update:
Device will not stay in temperature mode:
Higher coil resistances limit the max power with two cells or Max resistance is lower for two battery cell operation
out of TC mode is typically related to the use of low TCR wire with an
inaccurately entered mod resistance value. If you have a low resistance
build, say .08, and a very low TCR wire like stainless and have a mod
resistance of .008, but it is not entered, the combined resistance of
your wire and your mod, .088, coupled with the low TCR value will cause
the DNA200 chip to fail to see enough of a percentage change in the wire
to justify TC mode. If you are using low TCR wires then you must put
in a VERY accurate mod resistance and TRY to build higher resistance
DNA 200 is a step down converter designed to run from 3 Li cells is
series and is limited to a max output voltage of 9 V. Evolv released
firmware that allowed it to operate from 2 series cells at reduced power
(133 W). The max output voltage has also changed to 6 V (2 cells in
series). This changes the resistance range usable to between 0.0532 ohm
and 0.27 ohm for 133 W (max power).
DNA 200 with firmware
V1.2SP3 the battery bar shows empty after updating firmware and
sometimes after uploading settings or disconnecting the battery.
is a known issue Evolv are working on, it will not damage the mod or
battery and normally recovers after the mod goes into sleep mode, you
perform a soft or hard mod reboot or upload settings.