If this is a new installation, it may be that the battery just needs to be charged. Leave the power on for a while, then re-test.
If it is an existing exit light check the bulbs. If the bulbs are OK, the next suspect is the battery. Batteries Plus stores usually carry replacement batteries for various exit lights.
The only other culpret is the circuit board.
Usually the same make and model exit light are installed in the same building. Try swapping the suspect parts with known to be good bulbs and batteries from another fixture if you have one.
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