# Spitting coil and burnt taste: reading your build > Spitting coil, burnt taste, short circuit warning: read each symptom of a rebuildable build in turn and correct the cause instead of guessing. A build you fitted ten minutes ago starts throwing droplets of liquid into your mouth. The next puff tastes like scorched cardboard. Then the screen refuses to fire at all. A **spitting coil** and a burnt taste are the two complaints that put most new British vapers off rebuildables inside a fortnight, and both look like bad luck rather than a readable signal. They are not. Every symptom on a rebuildable deck points at one precise cause, and learning to read it beats stripping the whole thing down and starting again. This piece takes the common faults one by one, in the order a methodical vaper would work through them. ## Spitting coil and burnt taste: where to start Faced with a **spitting coil** or a burnt taste, the diagnosis follows three lines of enquiry: the liquid supply to the wick, the power being applied, and the electrical integrity of the build. Spitting almost always means too much liquid sitting against the wire. A burnt taste means the opposite, a wick that is not being fed fast enough. An error message on the screen belongs to neither category. It points at the circuit itself, and it is handled differently. Identifying which of the three families you are in sends you straight to the right correction without dismantling anything unnecessarily. That reflex avoids the classic beginner trap, rebuilding everything when a wick adjustment or a change of wattage would have done. A rebuildable build is repaired, not thrown away at the first misfire. Most faults clear in a few minutes once the cause is isolated, without touching the coil at all. ## Why a spitting coil throws liquid back Droplets reaching your mouth, often called spit back, are unpleasant rather than serious. They point at an imbalance between the amount of liquid present and the ability of the coil to turn it into vapour at the rate you are drawing. A build that spits usually has too much liquid in contact with the wire. The wicking cotton may be too sparse, the priming too generous, or the wraps too widely spaced, leaving pockets where liquid collects instead of being drawn into the fibre. The correction is a slightly fuller wick, a more measured amount of liquid at priming, and wraps that sit close together so heat spreads evenly. A gentle low power puff before you draw properly helps clear any surplus. If the noise and the droplets persist, tightening the spacing of the wraps makes the biggest single difference. ## Burnt taste and the dry hit The burnt taste is the symptom vapers dread most, because it ruins the session and lingers for hours afterwards. It describes a wick that is heating without enough liquid in it, which is what the vaping vocabulary calls a dry hit. The causes stack up. A wick packed too densely slows the liquid coming back to the coil, the wattage may be vaporising faster than the fibre can recharge, or a new build was simply not primed properly before the first draw. The answer comes in three moves: prime generously again, drop the power, and above all revisit the density of the fibre. Since the choice and fitting of the fibre decide so much here, a properly selected and fitted [wicking cotton](/uk/wicking-cotton-choosing-fitting/) removes a large share of dry hits on its own. ## Short circuit warnings on the screen When the display shows a warning instead of firing, the problem has moved out of the wick and into the electrical path. These messages are a protection working as designed, not a fault to be worked around. Warnings along the lines of short circuit detected, resistance too low or atomiser not recognised mean the device has measured something it considers abnormal and has refused to supply it. The usual culprit is a coil leg touching the deck, a loose post screw, or a wire brushing the chimney. Cut the power, inspect the deck under good light, move any stray leg away from the metal around it and retighten the posts. A reading on an ohm reader then confirms that the value has become stable and consistent again. Never force a device that is showing an error, because that warning protects the cell as much as it protects you. ## Uneven heating and hot spots A coil that glows crooked will never vaporise liquid evenly. Hot spots concentrate the heat in one place and cook the fibre there, which is why a burnt note can appear on a build that is otherwise well fed. A healthy coil glows from the centre outwards, symmetrically. If one wrap lights before the others, it forms a hot spot that scorches the fibre locally and dulls the flavour of everything you vape through it. The correction is made cold, then in short pulses. Close up any wraps that have drifted apart with a ceramic tool, check that both legs are properly clamped, and pulse again until the glow spreads evenly. A regular coil is the best insurance there is against a burnt taste that keeps coming back. ## Leaks, the other rebuildable fault Alongside the heating faults, leaking is the problem that wears people down day to day. It marks the device and empties the tank, but its causes are mechanical and they respond to the same methodical approach. A rebuildable that leaks usually has an unsuitable wick. Tails that are too thin let liquid run straight down the channels, while tails that are badly distributed open a path towards the airflow. The other suspects are a seal that was not reseated after a refill, a deck that is not screwed down firmly, or a liquid too thin for the geometry of that particular atomiser. The method is the same one that applies to a **spitting coil**, isolate the symptom before acting. Revisit the density and the placement of the fibre first, then the seals and the tightening, then the liquid. The order matters, and it resolves the vast majority of cases without a single new part. The full sequence of fitting and checking is covered in our guide to [building a coil](/uk/build-a-coil-step-by-step/). ## Frequently asked questions ### Why does my brand new build already taste burnt? The priming was almost certainly rushed. New fibre has to soak all the way through before the first heat: wet the wick and the coil, wait a minute, then take a few gentle puffs at low power. Skipping that step cooks dry fibre in the first few seconds. ### Is a coil that spits dangerous? No. Droplets are unpleasant rather than an electrical risk, and they simply signal an excess of liquid against the wire. A longer drip tip, a slightly fuller wick and a more measured priming clear the problem in most cases. ### What if the device still shows an error after retightening? Strip the coil out and refit it cleanly, checking that no leg touches the deck or the chimney. Trim the legs flush with the posts, clamp them firmly and measure again. If the error survives a properly fitted new coil, the deck itself may have a contact fault. ### Should I change the wick or the coil when it burns? Always start with the wick, which is quicker and often enough on its own. If the burnt taste returns despite fresh fibre at a sensible density and a sensible wattage, the coil is the part to redo, either fouled with residue or distorted. ### Why is my vapour dropping off with a harsh taste? That pairing points at fibre at the end of its life, saturated with residue, or a liquid supply that is running dry. Check the level in the tank, replace the fibre and clean the coil if needed. Falling vapour with a harsh edge is the classic signal that the wick needs renewing. ## Taking back control of your rebuildable build A **spitting coil**, a burnt taste or a warning on the screen are not bad luck, they are readable symptoms, each pointing at a precise cause and a simple correction. Reading the signal before acting saves you from dismantling blind and saves a surprising amount of liquid along the way. That diagnostic habit, far more than experience with any one atomiser, is what separates a confident rebuildable vaper from someone who simply endures their builds. The electrical side of the same discipline, and the reason a measurement always comes before a first fire, is set out in our piece on [Ohm's law and battery safety](/uk/ohms-law-rebuildables-battery-safety/). Editorial content for adult readers only. Vaping products usually contain nicotine, a substance that causes addiction. Not for sale to under-18s in the United Kingdom. This article is not a buying recommendation.