US Stove Overheating Due to Restricted Airflow

Furnace frequently trips the high limit and shuts down on hot days or when ducts are closed.

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

Closed or blocked supply registers, Dirty air filter, Undersized or restricted ductwork, Failing convection blower

Safety first: Allow the furnace to cool after a high limit trip. Do not bypass the high limit switch.

Steps:

1. Open registers: Ensure all supply and return registers are open and unobstructed.
2. Replace or clean filters: Dirty filters greatly reduce airflow. Replace with the correct size and type.
3. Inspect ductwork: Look for crushed, kinked, or undersized ducts. Have a professional correct duct issues if needed.
4. Check convection blower: Verify the blower is running at full speed and not overheating. Replace if weak or noisy.

Medium 3/5

High Limit Switch or Convection Blower

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