Have HVAC Questions? Ask an HVAC Expert for Answers
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Is the unit displaying or flashing any error codes on the board in the furnace or airhandler?
Ok is this a furnace or just an airhandler?
It sounds like a thermal limit may have tripped and the unit has overheated then it will run the blower all the time, this may or may not be something you can repair depending on your electrical knowledge or skill level. Are you skilled?
Yes shut the power off to the unit for 1 full minute then turn it back on see if it all works again and let me know.
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That would be related as it could cause the issue for sure.
Have you checked to see if any thermostat with a reset button in the unit was tripped? There are thermal rollouts in the unit that you should check.
There should be more than one.
No it should be where the heater is
No where the heater element is.
Do you have electric heaters? If so where they are.
If you remove the G wire to the thermostat does the fan stop?
Then you either have a safety device tripped or a stuck relay on the board.
It would be hard to say without seeing the wiring diagram