Checked coils did`nt see any breaks or anything

Could be the heat sequencer is gone bad

If you are getting power at the coils they should be working? How many elements do you have? Is this a heatpump or strait electric furnace?

Have 2 seprate units 3 coils on top 2 coils on bottom... old split system

These control the heaters. Voltage checks here will verify control function.