Drum of the dryer was rotating but no heating

First I removed the back cover (several screws). Then, I disconected wires from the high-limit thermostat and the thermal cut-off fuse (both of these parts were included in the Thermal Cut-Off Kit). Then, I removed four screws that hold these two parts, replaced the parts, put the screws back, and attached the wires. Finally, I put back the cover.