ICP Pressure Switch Tubing for WPG4424090LKB1 — OEM Hose | Ships Today

Overview

This genuine OEM pressure switch tubing (part number 1178417) is the hose that connects the draft inducer to the pressure switch on the ICP / Tempstar / Heil WPG4424090LKB1 package gas unit. When the inducer runs, it creates the negative pressure that this tubing carries to the pressure switch, proving adequate draft before the control board allows the igniter and burners to fire. Over time the tubing can crack, harden, kink, or fill with condensate, which blocks the pressure signal and prevents the switch from closing. The result is a furnace that runs the inducer but locks out on a pressure-switch fault and never ignites. Replacing brittle or clogged tubing restores a clean draft-proving signal.

Specifications

Compatibility

Designed for the WPG4424090LKB1 package gas unit and related ICP, Tempstar, Heil, and Comfortmaker gas furnaces using this pressure switch hose. Match the routing and length against your existing tubing before ordering.

Installation Guide

1. Safety First — Disconnect power and shut off the gas supply, then verify zero voltage with a multimeter.
2. Access — Remove the burner and control access panels.
3. Document — Photograph the tubing routing and both connection points.
4. Remove — Pull the old tubing off the inducer port and the pressure switch nipple, noting the routing.
5. Install — Press the new tubing firmly onto both ports, routing it so it cannot kink, sag, or trap condensate.
6. Test — Restore gas and power, call for heat, and confirm the inducer starts, the pressure switch closes, and the burners light.

Signs You Need a Replacement

• Inducer runs but the furnace locks out on a pressure-switch fault
• Cracked, hardened, or kinked tubing
• Condensate or debris trapped inside the hose
• Intermittent no-heat calls tied to draft proving

Shipping & Returns

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