Trane Draft Proving / Pressure Switch Problem

The furnace inducer runs continuously, but the burners do not light.

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

Pressure switch stuck closed, blocked condensate drain on the inducer housing, faulty inducer motor, control board not recognizing switch state

Safety: Turn off power before servicing.

Steps to check:

Condensate at inducer: For condensing Trane furnaces, inspect the condensate drain at the inducer housing for clogs and clear as needed.
Pressure switch tubing: Remove and clear tubing between the inducer and the pressure switch.
Switch test: With power off, test pressure switch continuity; it should be open when the inducer is off.

When to call a professional: If the switch is stuck or the inducer is failing, have a technician replace the faulty component.

Hard 4/5

Pressure Switch

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