Lennox Wind-Induced Pressure Switch Trips

Furnace occasionally shuts down and restarts after windy conditions; vent terminations are on the windward side of the house.

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.

Possible Causes

Improperly located Lennox PVC vent terminations, Vent termination too close to corners or obstacles, Inadequate vent support causing sagging, Pressure switch sensitivity

How to Fix / Troubleshooting

Safety: Turn off power before inspecting venting.

1. Inspect vent terminations: Ensure intake and exhaust are installed per Lennox and code clearances from corners, windows, and grade.
2. Check for sags: Support PVC venting to prevent low spots where condensate can collect.

Relocating or modifying vent terminations to reduce wind effects should be done by a qualified installer.

Repair Difficulty

Hard 4/5

Required Part

Vent Termination Kit

Check Price on Amazon

We may earn a commission from links on this page.