ICP Pressure Switch with Tubing for WPG4484090RKA1 — OEM Part 1178417 | Ships Today

Overview

This genuine OEM pressure switch with tubing (part number 1178417) is the safety device that proves correct draft before the burners can light on your ICP WPG4484090RKA1 packaged gas unit. When the inducer motor starts, it creates negative pressure sensed through the attached tubing; the switch then closes to tell the control board that venting is clear and combustion air is flowing. If the vent is blocked, the inducer is weak, or the switch or tubing fails, the contacts stay open and the board locks out ignition to prevent unsafe operation. A cracked tube, clogged port, or stuck switch is a frequent cause of no-heat lockouts.

Specifications

Compatibility

Specified for the heating section of the ICP WPG4484090RKA1 packaged gas/electric unit and the matching Tempstar, Heil, and Comfortmaker models built on this chassis. Match the pressure setpoint ("WC) and port configuration stamped on your original switch before installing.

Installation Guide

1. Safety First — Disconnect power and shut off the gas, then verify zero voltage with a multimeter.
2. Access — Remove the burner/control compartment service panel.
3. Document — Photograph the switch wiring and tubing routing before disconnecting.
4. Remove — Pull the spade terminals, slide the tubing off the port, and unscrew the old switch.
5. Install — Mount the new switch, attach the tubing to the correct port with no kinks, and reconnect the leads per your photo.
6. Test — Restore gas and power, run a heat cycle, and confirm the switch closes after the inducer starts and the burners light.

Signs You Need a Replacement

• Furnace locks out on a heat call with no burner ignition
• Inducer runs but the switch never closes
• Cracked, brittle, or disconnected sensing tubing
• Switch stuck open or closed when tested with a manometer

Shipping & Returns

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