I have an Amana air handler which has been installed for a few years. The fan blower will not turn off. I have checked the thermostat settings, disconnected the thermostat, turned off/on the power to the air handler( it comes back on), and after all of this, the blower still won't turn off. I am a little rusty troubleshooting circuits, could the problem be the electronic blower time delay relay? Thanks.