Atlantic Chronic Overheating

Furnace frequently trips the high limit but no error code is displayed; unit is very hot to the touch.

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

Undersized duct system, Closed registers, Dirty secondary heat exchanger (condensing models), Blower running at too low speed

Safety: Overheating can damage the heat exchanger. Turn off power if panels feel excessively hot.

Steps:

Maximize airflow: Open all registers and ensure return grilles are unobstructed.
Clean components: Have a technician clean the secondary heat exchanger and evaporator coil (if present) to restore airflow.
Increase blower speed: A professional can adjust blower speed settings on the Atlantic control board.

Recommendation: If overheating persists, a full system evaluation (duct sizing, furnace capacity) is needed.

Hard 4/5

Secondary Heat Exchanger

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