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@anna-rolcova please post your config.g using the </> in the text formatting to make it easy to read. Also provide some more information about which temperature sensor is not working. How is the heater connected, what heater etc
see https://duet3d.dozuki.com/Wiki/FAQ#Section_M307_Heater_1_appears_to_be_over_powered_If_left_on_at_full_power_its_temperature_is_predicted_to_reach_521C
As @bearer points out, please fill out the form.