Replaces the fan (blower) switch part of the fan limit switch inside my furnace. - heavyjoost/furnace_fan_switch
The fan switch on the thermostat is set to “on” rather than “auto” Relays in the control board are stuck in the closed position, so the blower is getting a constant supply of electricity, and the control board must be replaced
have found many times is when they manufactured the venter motor assembly they painted it black, Paint chips would flake off make their way to the pressure switch and block off air flow . To fix this problem you would need to replace the motor assembly, pressure switch, and vacuum lines ....