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The Original Prusa XL is showing the message "Check the heatbed thermistor wiring for possible damage".
The error might indicate an issue with the thermistor that is part of a heatbed tile.
Error name: Thermal runaway
Error code: #17203
Check the heatbed tile for physical damage, for example, a scratch on any heatbed tile surface, or a cable in bad status on the bottom of a heatbed tile. Identify the heatbed tile number from the image below.
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Check that the indicated heatbed cable is correctly connected with the modular bed electronics, and with the heatbed tile, and reseat the connection.
Follow the dedicated guide on replacing the affected heatbed tile.