My furnace blower has turned on and will not turn off without turning the power off to the unit. I have tried resetting the thermostat and have had no luck fixing this problem. It is mid-summer and the heat has not kicked on. What should I do?

Make sure the thermostat blower switch is on automatic and not on.

You might have a defective blower relay /fan limit control or circuit board causing this problem.

Also a high limit roll out trip can also cause the problem you are having.

If you have a meter and tools you can check it yourself but if like most other you will have to call for Professional On Site service and have them test the unit and effect a repair.