You have installed the CO₂ bottle of the fire suppression system in the xTool P3, but xTool Studio still says no bottle detected: it notifies you when starting a job, or in the device settings it appears as "not installed." Before thinking about a malfunction, it is almost always one of three things: the bottle touches the casing, it does not meet the specifications, or it has little gas left.
This guide adapts xTool’s support documentation about the undetected bottle error on the P3 into Spanish. We are honest here: we haven’t had to touch the bottle since we installed it, so the diagnostic procedure is the official one. What we do provide is the context of why that bottle is not optional.
Why this is not a minor warning
The bottle feeds the internal extinguishing system of the P3. If the machine does not detect it, you are cutting without an extinguisher, and that on an 80 W CO₂ is not a configuration detail.
We say this from experience. Our bottle arrived late because xTool had a stock shortage, and right during that gap we had two real fires inside the machine, with emergency stops. We tell the whole story in “the fire is real”, and the conclusion remains the same as xTool’s own recommendation: do not leave jobs unattended, especially cutting jobs. If the machine tells you it doesn’t see the bottle, fix it before continuing production.
Why the system doesn’t detect it
The P3 detects the bottle through two means: a weight sensor and a physical switch that activates when the bottle is fully screwed in. If either does not signal, the result is “not installed.” From this come the causes:
- Incorrect placement: the bottle rubs against the outer metal casing and part of its weight is transferred there.
- Low gas: the total weight has dropped below the threshold the machine considers a valid bottle.
- Incompatible bottle: different thread, it does not activate the switch no matter how much you tighten.
- Weight sensor miscalibrated: requires a software reset.
- Loose wiring in the weight sensor, detection switch, or extinguishing module.
Checks without opening the machine
In order, from the simplest to the rarest:
- Is there really a bottle? The P3 does not include a bottle by default. If it came in a bundle, check that it is installed and not still in its box.
- Center it on the mount. It must be roughly centered on its anchor, without touching the metal casing. If it rubs or rests against it, the sensor measures less weight than actual and reports it as absent. Remove and reinstall it centered.
- Screw it in fully. The detection switch only activates with the bottle completely screwed in. If you feel it stops before, don’t force it: it’s a threading problem, not a tightening one.
- Weigh it. Remove it and place it on a kitchen scale. 700 g or less: it’s empty, replace or refill it. More than 700 g: it has enough gas and the problem lies elsewhere.
Exact specifications
If the bottle is not correct, no amount of tightening will help: it won’t activate the sensor. These are the specs the P3 requires:
- Type: carbonator / soda bottle of 0.6 L.
- CO₂ capacity: minimum 400 g filling.
- Neck thread: M18×1.5.
- Valve thread: TR21×4.
These are the standard measurements for sparkling water carbonator bottles, which is fortunate: they can be found and refilled in Spain without depending on xTool. If you are going to buy a replacement, verify both threads—there are 0.6 L bottles with different necks—or go for the brand’s own bottle [xTool EU] and save yourself the check.
Weight sensor reset
If the bottle is properly installed, is the correct one, and weighs more than 700 g, the next step is recalibration. In xTool Studio: … > Device Settings > Device Settings > Reset, and follow the on-screen instructions to reset the weight sensor. An accumulated calibration drift causes the system to misread the weight even if the bottle is full.
If you need to open the machine
From here you remove the casing, so: disconnect the P3 from power first. xTool has videos for assembly and disassembly of the covers, and it’s advisable to watch them before starting.
- Left panel — weight sensor. Check the sensor connectors: see if any are loose or disconnected. Plug them in fully, reassemble the cover, connect and restart.
- Rear panel — detection switch. With the panel off, screw in the bottle and check if it reaches the end. If it doesn’t, it’s the bottle: replace it with one that meets the thread specs. If it fits well, check the mounting screws and the switch connector; unplug and plug it back in, reassemble and restart.
- Extinguishing module. If all the above is correct, the fire suppression system’s control module may be faulty and needs replacement. That is support territory.
For the support ticket, have ready: problem description and steps you have taken, photo or video of the installed bottle, scale reading and connectors, serial number, and exported job log. If progress is slow, you can escalate via Discord.
Frequently Asked Questions
Can I keep working while I fix this?
You can, but you would be cutting without automatic extinguishing. Our recommendation—and xTool’s—is no, especially for cutting and never unattended. We went through this unintentionally and ended up with two fires.
The bottle is new and it still says it’s not installed.
First check if it rubs the casing: it’s the most frequent cause and the easiest to overlook because it looks properly installed at first glance. Then check the threads (M18×1.5 on the neck, TR21×4 on the valve) before suspecting the sensor.
How do I know when it’s running low without waiting for the alert?
By weighing it. Below 700 g total weight it’s empty. If you do a lot of cutting, noting the weight every few months prevents discovering it when you really need it.
Does any supermarket soda siphon bottle work?
Only if it meets all four specs: 0.6 L, minimum 400 g CO₂, M18×1.5 neck, and TR21×4 valve. The format is common for domestic carbonators, but there are thread variants. Check before buying.
Written by Noemi and Javi, from Picasita. We have been using an xTool P3 [xTool EU] in production since October 2025; we are xTool affiliates. This guide adapts the brand’s official documentation; the original is in their support center. More tutorials and solutions.
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