ICP Pressure Switch Tubing for WPG4484115LKB1 — OEM Sensing Line | Ships Today

Overview

This OEM pressure switch tubing (part #1178417) is the sensing line that connects the induced-draft pressure switch to the inducer housing or collector box on the ICP/Tempstar/Heil WPG4484115LKB1. It transmits the negative pressure created by the inducer motor to the pressure switch diaphragm, proving that combustion airflow and venting are correct before the control board allows ignition. A cracked, kinked, clogged, or brittle tube prevents the switch from closing, which locks out the burners. Typical failure signs include the inducer running but no ignition, repeated lockouts, or condensate/debris blocking the line.

Specifications

Compatibility

Direct OEM replacement tubing for the pressure switch circuit on ICP, Tempstar, Heil, and Comfortmaker units built around the WPG4484115LKB1 platform. Match the tube length and port size to your original before installing.

Installation Guide

1. Safety First — Shut off gas and disconnect power, then verify zero voltage with a multimeter.
2. Access — Remove the blower/control service panel.
3. Document — Photograph the tube routing and both port connections before removal.
4. Remove — Pull the old tubing from the pressure switch and inducer/collector ports; inspect ports for soot or moisture.
5. Install — Route the new tube without kinks, seat both ends fully, and confirm a snug fit.
6. Test — Restore power and gas, start a heat cycle, and confirm the switch closes and burners light.

Signs You Need a Replacement

• Inducer runs but burners never ignite
• Repeated pressure-switch lockout fault codes
• Visible cracks, kinks, or hardening of the tube
• Moisture or debris trapped inside the sensing line

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.