IVT Premature shutdown due to overheating or sensor issues

Furnace starts but shuts down after a few minutes; radiators or ducts only lukewarm

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

Restricted airflow, Faulty temperature sensor, Circulation pump not running (hydronic), High limit opening

Safety: Turn off power before internal checks.

Check filter and vents: Replace dirty filters and open all vents.
Verify pump/blower: Ensure the circulation blower (air) or pump (water) runs continuously while the burner is on.
Observe error codes: After shutdown, check the IVT display for any stored fault codes and address them.
Inspect sensors: If no code is shown, have a technician test the flow/return sensors and high limit switch.

Medium 3/5

IVT flow temperature sensor

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