Day & Night
Pressure Switch Not Closing
Thermostat calls for heat but furnace only runs the inducer; burners never ignite and no error code is visible to the homeowner.
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Safety Warning
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.
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Possible Causes
Blocked intake or exhaust, failed pressure switch, cracked inducer housing, loose pressure tubing
How to Fix / Troubleshooting
Safety first: Turn off power before servicing. Do not bypass the pressure switch for operation.
- Outdoor vent check: Inspect intake and exhaust terminations for obstructions and clear them.
- Inspect tubing and switch: Ensure tubing is intact and firmly connected. Listen for the pressure switch click when the inducer starts.
- Condensate check: On condensing models, clear the condensate trap and lines to prevent water from blocking the pressure port.
If the pressure switch does not close even with clear venting, it or the inducer may need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Pressure Switch
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