---
title: Why does my ToxCO have a gas cylinder and red warning triangle symbol?
description: Calibration Overdue On ToxCO
---

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1. [Help Centre](https://support.bedfont.com/en/knowledge?hsLang=en)
2. [ToxCO](https://support.bedfont.com/en/knowledge/toxco?hsLang=en)
3. [On screen symbols](https://support.bedfont.com/en/knowledge/toxco?hsLang=en#on-screen-symbols)

# Why does my ToxCO have a gas cylinder and red warning triangle symbol?

## Calibration Overdue On ToxCO

![ToxCO-overdue](https://support.bedfont.com/hs-fs/hubfs/ToxCO-overdue.png?width=300&name=ToxCO-overdue.png)This indicates that the device needs calibrating, you can find instruction of how to calibrate the device in the [manual](https://www.bedfont.com/toxco-manuals#content).

If the problem persists or has not been resolved by the information provided above, please contact your local distributor for more information. Find out who your local distributor is from our website [here](https://www.bedfont.com/find-my-distributor). 

- [NObreath](https://support.bedfont.com/en/knowledge/nobreath?hsLang=en#main-content)

    - [FAQ](https://support.bedfont.com/en/knowledge/nobreath?hsLang=en#faq)
    - [On screen symbols](https://support.bedfont.com/en/knowledge/nobreath?hsLang=en#on-screen-symbols)
    - [Device function issues](https://support.bedfont.com/en/knowledge/nobreath?hsLang=en#device-function-issues)
    - [Infection control](https://support.bedfont.com/en/knowledge/nobreath?hsLang=en#infection-control)
    - [Safe Breath Testing During COVID-19](https://support.bedfont.com/en/knowledge/nobreath?hsLang=en#safe-breath-testing-during-covid-19)
    - [Firmware](https://support.bedfont.com/en/knowledge/nobreath?hsLang=en#firmware)
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    - [FAQ](https://support.bedfont.com/en/knowledge/smokerlyzer?hsLang=en#faq)
    - [On screen symbols](https://support.bedfont.com/en/knowledge/smokerlyzer?hsLang=en#on-screen-symbols)
    - [Device function issues](https://support.bedfont.com/en/knowledge/smokerlyzer?hsLang=en#device-function-issues)
    - [Maintenance](https://support.bedfont.com/en/knowledge/smokerlyzer?hsLang=en#maintenance)
    - [Infection control](https://support.bedfont.com/en/knowledge/smokerlyzer?hsLang=en#infection-control)
    - [Safe Breath Testing During COVID-19](https://support.bedfont.com/en/knowledge/smokerlyzer?hsLang=en#safe-breath-testing-during-covid-19)
    - [Firmware](https://support.bedfont.com/en/knowledge/smokerlyzer?hsLang=en#firmware)
- [Gastrolyzer](https://support.bedfont.com/en/knowledge/gastrolyzer?hsLang=en#main-content)

    - [FAQ](https://support.bedfont.com/en/knowledge/gastrolyzer?hsLang=en#faq)
    - [On screen symbols](https://support.bedfont.com/en/knowledge/gastrolyzer?hsLang=en#on-screen-symbols)
    - [Device function issues](https://support.bedfont.com/en/knowledge/gastrolyzer?hsLang=en#device-function-issues)
    - [Maintenance](https://support.bedfont.com/en/knowledge/gastrolyzer?hsLang=en#maintenance)
    - [Infection control](https://support.bedfont.com/en/knowledge/gastrolyzer?hsLang=en#infection-control)
    - [Firmware](https://support.bedfont.com/en/knowledge/gastrolyzer?hsLang=en#firmware)
- [Medi-Gas Check](https://support.bedfont.com/en/knowledge/medi-gas-check?hsLang=en#main-content)

    - [FAQ](https://support.bedfont.com/en/knowledge/medi-gas-check?hsLang=en#faq)
- [ToxCO](https://support.bedfont.com/en/knowledge/toxco?hsLang=en#main-content)

    - [On screen symbols](https://support.bedfont.com/en/knowledge/toxco?hsLang=en#on-screen-symbols)
    - [Device function issues](https://support.bedfont.com/en/knowledge/toxco?hsLang=en#device-function-issues)
    - [Maintenance](https://support.bedfont.com/en/knowledge/toxco?hsLang=en#maintenance)
    - [Infection control](https://support.bedfont.com/en/knowledge/toxco?hsLang=en#infection-control)
- [FAQ](https://support.bedfont.com/en/knowledge/faq?hsLang=en)

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