Tappan Blower Stuck On

Furnace blower runs continuously even when thermostat is not calling for heat or fan.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Fan switch set to ON at thermostat, stuck blower relay on Tappan control board, high limit switch open causing fan-only mode

Safety: Turn off power before accessing the control board.

Steps:

Check the thermostat fan setting. Set it to AUTO instead of ON.
If blower continues to run, remove the blower door and check the LED code. If a limit fault is present, troubleshoot the limit circuit as described in limit-related entries.
If no fault code is present, the blower relay on the control board may be stuck closed. Inspect the board for burned spots and replace if necessary.

Medium 3/5

Integrated Furnace Control Board

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