If your heat strips are not coming on, then there are a few things to check.
The first one would be that the heat strips are actually working. The easiest way to complete this task is to turn the system on into emergency heat and turn the thermostat up. If you get heat accompanied by the traditional strip heat burnt smell, then you know the electric heat strips are working.
The second thing would be that the air handler is receiving a command for heat during defrost cycle. If the command is present with no heat, then you most likely have either a wiring issue or a failed electrical relay or contactor.
The third thing would be the defrost board itself, for it is the component that calls for electric heat strips to come on during a defrost cycle. You may or may not be able to force the defrost board into a defrost cycle and then check that the heat strips are on or not.
It sounds as though your defrost board is bad with the symptoms you are describing.
Good luck.
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