Without knowing the exact humidifier and how it's wired one can only guess.
There are many different ways to wire a humidifier, one method involves the use of a current sensing relay monitoring the operation of the furnace fan motor. Another uses the HUM terminals on the furnace to control the humidifier.
Has the humidifier ever worked properly? If so, a component has failed. If not, it wired incorrectly and you need to refer back to your installation manual.
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