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I just assembled my Ender 3 last night, this is my first printer and I’m new to this all. After about 10-15 minutes into printing it consistently gives me a thermal runaway error. Any help would be appreciated.

The (part cooling) fan is spinning.

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    $\begingroup$ Photo of the machine please? $\endgroup$
    – Trish
    Commented Feb 19, 2022 at 22:42

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Thermal runaway occurs when the hotend is on, but the sensor does not pickup any temperature increase. In many cases the thermistor is broken or the connection is bad. A friend of mine had the thermistor broken on his Ender 3 pro. It worked sometimes and sometimes not. Buy a new thermistor.(a few $ only) and replace it to be sure.

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