Ruud Duct Expansion/Contraction or Overheat Cycling

Furnace or ductwork makes loud popping or banging noises shortly after startup or shutdown.

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

Thin or undersized ductwork, High temperature rise due to low airflow, Closed registers causing high static pressure, Furnace firing rate too high

Safety: Ensure the furnace is not overheating; repeated limit trips can damage components.

Steps to check:

Open registers: Open all supply registers to reduce static pressure and temperature rise.
Replace filter: Install a clean filter to improve airflow.
Inspect accessible ducts: Look for oil-canning (flexing) sheet metal. Reinforcement or resizing may be needed by a duct specialist.
Have technician check temperature rise: A Ruud technician can measure temperature rise across the furnace and adjust blower speed or gas input if necessary.

Medium 3/5

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