An image forming apparatus includes a controller, a conveyance unit, and an image forming unit to form an image on a sheet conveyed by the conveyance unit along a conveyance path. The controller controls to stop conveyance by the conveyance unit where a first abnormality is detected in the image forming apparatus, and controls to execute first determining processing for determining a failure portion that is a cause of the first abnormality. The controller controls to stop conveyance by the conveyance unit where a second abnormality is detected in the image forming apparatus, and controls to execute second determining processing for determining a failure portion that is a cause of the second abnormality. The first determining processing is executed without outputting announce information for prompting removal of a sheet remaining in the conveyance path. The controller outputs the announce information and executes the second determining processing.