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For safety it is strongly recommended to make sure that your printer detects if the thermistor stops sending correct temperatures for any reason.

Set the two highlighted lines to: #define HEATER_0_MINTEMP 5 and #define HEATER_1_MINTEMP 5 respectively

In newer versions of Marlin there are other features such as Thermal Runaway Protection that might be useful as well, though they are typically on by default.