Fan on furnace stays ON at all times even when thermostat is on OFF position.
Only way to shut it off is from breaker box

Bryant model 961-042-025A

Is the system heating well otherwise? If so, the fan control has contacts fused (like welded) together, preventing the blower from turning off.

I came home today and fan is off on Auto position, but the temperature in the house is off by 17 degrees from thermostat temp set up ( house temp 60 thermostat temp 77 ) and the fan would shut off

Is this a packaged electric heat/cooling unit? If so, sounds like something is awry with the heat relay.