Innokin devices typically use three quick clicks of the fire button rather than the five most brands use; the T18X and Go Z both follow that pattern. If three clicks does nothing on your model, try five, and charge the device first; a flat battery ignores every click combination.
On the Zenith-family tanks, unscrew the base, pull the old coil straight out, push the new one in and refill. Add a few drops of liquid to the new coil’s ports and let the filled tank stand for five minutes before vaping; Z-coils reward patient priming with weeks of service.
They are practically designed for it. The Endura line’s tight draw and simple operation mimic a cigarette closely, and UK stop-smoking services have handed out Innokin pens for years. Pair a T18X with a 10mg or 20mg nic salt and you have one of the most proven quit setups there is.
Turn it off and on with three clicks, then remove the tank, wipe both sets of contacts and reseat everything. That clears the vast majority of no-fire and check-atomizer complaints. If a specific coil keeps triggering errors, swap it; coils fail far more often than devices.
The Zenith, Zlide and Z-Force tanks all share the Z-coil platform, which is the beauty of the range. The T18 line uses its own Prism coils. Both families are stocked in our Innokin coils section, labelled by tank.