Furnace shuts down intermittently; auxiliary limit open indicated on diagnostic chart.

Safety: Turn off power before removing panels or accessing the evaporator coil.

Steps to check:

• Inspect coil above furnace: If your Maytag furnace is installed with an A-coil for air conditioning, remove the coil access panel and visually inspect for heavy dust or matted debris on the coil fins.
• Clean coil (basic): Light dust can sometimes be removed with a soft brush and vacuum. For heavy buildup, a professional coil cleaning is recommended.
• Check blower wheel: Inspect the blower wheel for dust buildup that can reduce airflow. Clean if accessible and safe to do so.

When to call a technician: If the auxiliary limit continues to open, or if the coil is heavily impacted, schedule professional service.