Many electric furnaces operate in two stages, and the bottom element is only supposed to come on in the second stage.
If this is not the case with oyurs, then you aparently have a relay or "heat sequencer" that is not working.
It could be that the relay is stuck in the open position, or that its not getting 24V to the coil telling it to come on.
Check for 24V at the coil, if you have it, and do not have voltage coming out of the top of the relay, then its a bad relay.
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