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A Home Assistant thermostat mystery traced to a toddler, with Claude

Claude helped troubleshoot radiator thermostats whose child lock kept switching on and off, which turned out to be a one-year-old holding the button.

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Credits

  • Reddit poster sorryItsAHabit Source ↗

Earliest dated source: 5 Feb 2026

The full story

In a first Home Assistant build, the owner added temperature sensors and smart radiator thermostats with a 24-hour heating schedule. They then saw the child lock toggling every few hours, temperature settings fluctuating and the heating switching on and off, and spent a few days troubleshooting.

With Claude's help they found the cause: holding the thermostat button for three seconds toggles the child lock, and their one-year-old had been doing exactly that. The next step was an automation to switch the child lock back on whenever it is turned off.

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Sources

From a short post by the maker, so the details are as they tell them.

  • Reddit: Child Lock mysteryForum threadreddit.com
    Reddit poster: sorryItsAHabitPosted 5 Feb 2026

    The maker's post on r/homeassistant.

    If it disappears: archived copy of Reddit: Child Lock mystery (opens in a new tab)

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