My heater works but won t turn by itself. I need to turn the "emergency switch" off and on a few times before it will come on. Replaced the control module. No change. What else could it be? Need help.

What "control module" did you replace?

Small white box at bottom. HE I furnace control mod. Has light to diagnose problem..

It sounds like you might have a line voltage problem. Check all connections between the breaker panel & the furnace. Be sure to turn off the breaker before working on any line voltage connections. Problem could be in the switch. They are cheap & easy to replace.