Pennco Intermittent Venting / Pressure Switch Trips

Boiler lockout occurs randomly, often during windy conditions

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

Improper vent termination location, Wind-induced downdraft, Marginal flue pressure switch setting, Partially blocked vent

Safety first: Turn off power and gas before working on venting.

Inspect termination: Ensure vent and intake terminations meet Pennco and code clearances from corners, windows, and grade.
Check for obstructions: Look for debris or ice at terminations and in accessible vent sections.
Secure piping: Make sure vent piping is properly supported and sloped.
Professional adjustment: A technician may need to verify pressure switch operation and vent sizing.

Hard 4/5

Flue Pressure Switch

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