Furnace will not start at all; no blower, no inducer, no LED lights on the Keeprite control board.

Safety: Before resetting breakers or touching wiring, ensure your hands are dry and you are standing on a dry surface.

Steps:

• Check thermostat: Confirm the thermostat display is on and calling for heat.
• Verify breaker: Locate the furnace circuit breaker in the electrical panel. If tripped, reset it once by switching fully OFF then ON. If it trips again, do not continue resetting—call a technician.
• Check furnace switch: Ensure the furnace service switch (often looks like a light switch near the unit) is in the ON position.
• Inspect blower door switch: Make sure the blower door is properly installed and depressing the door safety switch.
• Check internal fuse: With power off, inspect the low-voltage fuse on the control board and replace if blown.

If there is still no LED or response, a line-voltage wiring issue or failed control board is likely and should be handled by a professional.