What causes blower motor to shut off immediately after start up?

A blower motor may shut off immediately after startup due to several potential issues. Common causes include a faulty blower motor resistor, a malfunctioning relay, or a problem with the wiring or connections, which can lead to insufficient power supply. Additionally, a blown fuse or a short circuit in the system can also cause the motor to stop running. It's important to diagnose the specific issue to ensure proper functionality and safety.