What is the first step to take if the burner motor has power but won't turn?

The appropriate first step when the burner motor has power but will not turn is to check the blower wheel. This is essential because if the blower wheel is obstructed or jammed, it can physically prevent the motor from turning, even if it is receiving electrical power. By inspecting the blower wheel for blockages or damage, you can determine if the issue is mechanical in nature.

Addressing this point first can save time and prevent unnecessary troubleshooting of electrical components or controls that may not be the root cause of the issue. It's important to ensure that all mechanical components are free to operate before delving deeper into electrical diagnostics or examining motor conditions. This approach fosters a systematic methodology in troubleshooting, which is crucial for effective problem resolution in oil heating systems.