ICP Pressure Switch Tubing for WPG4484090LKA1 — OEM Furnace Sensing Line | Ships Today

Overview

The OEM 1178417 pressure switch tubing is the flexible sensing line that connects the inducer/collector box to the furnace pressure switch on ICP, Heil, and Tempstar equipment. This small hose carries the negative pressure signal the switch uses to confirm the inducer is moving combustion air before the control board allows ignition. When the tubing cracks, hardens, kinks, or collects condensate, the switch can no longer sense proper draft — so the furnace locks out, short cycles, or refuses to light even though the inducer runs. Replacing aged or damaged tubing restores a clean pressure signal and reliable safe-start operation.

Specifications

Compatibility

Direct OEM replacement tubing for the ICP/Heil/Tempstar WPG4484090LKA1 package unit and related ICP-family furnaces that route the pressure switch through this sensing line. Verify the routing and connection points against your existing hose before installing.

Installation Guide

1. Safety First — Turn off electrical power and the gas supply, and verify zero voltage with a multimeter.
2. Access — Remove the furnace blower/control access panel.
3. Document — Photograph how the tubing routes between the inducer/collector box and the pressure switch port.
4. Remove — Pull the old tubing from both barbed fittings, inspecting the ports for soot or moisture.
5. Install — Push the new tubing fully onto each fitting, matching the original routing with no kinks or low traps.
6. Test — Restore power and gas, start a heat call, and confirm the switch closes and the burners light normally.

Signs You Need a Replacement

• Furnace inducer runs but burners never ignite
• Pressure switch lockout or fault code on the board
• Cracked, brittle, kinked, or moisture-filled tubing
• Intermittent short cycling on the heat call

Shipping & Returns

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