IVT Short cycling due to control or airflow issues

Furnace short cycles; starts and stops frequently without reaching set temperature

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

Oversized furnace, Dirty filter restricting airflow, Faulty thermostat placement, High limit switch opening intermittently

Safety: Turn off power before removing panels.

Replace or clean filter: Ensure the return air filter is clean and correctly installed.
Check vents: Open all supply and return vents to reduce static pressure.
Review thermostat location: Make sure the thermostat is not near heat sources, direct sunlight, or supply registers.
Monitor operation: Observe whether the burner shuts off due to high limit trips (fan continues running). If so, have a technician check blower speed, duct sizing, and the high limit switch.

Medium 3/5

IVT high limit thermostat

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