Why does an electrician need to wire some of my OPI Blue fan control system?

By law, it is required that an electrician complete the install on systems which involve very high voltage power.

All electrical wiring that deals directly with the fan and heater control operation must be completed by a Certified Electrician. This includes: Transformers, Power Supplies, Relays and Hand Off Auto Switches (HOA). Please follow all local electrical code guidelines applicable by law. Failure to follow these guidelines may result in incomplete operation of equipment, damage to the equipment or personal harm, resulting in severe injury or even death due to High
Voltages present.