ICP Tubing Pressure Switch for WPG3304040LKC1 — OEM 1178417 | Ships Today

Overview

This genuine OEM tubing pressure switch (part #1178417) is the safety device that proves proper draft on the ICP/Heil/Tempstar WPG3304040LKC1 packaged unit. Before the control board allows the igniter and gas valve to energize, the inducer motor must pull a vacuum that closes this pressure switch through its sensing tube. This confirms the venting is clear and combustion gases can safely exhaust. A failed switch, a cracked tube, or a clogged port will stop the ignition sequence cold — the inducer runs but the burners never light. Replacing the switch with the correct factory part restores safe, reliable furnace operation.

Specifications

Compatibility

Direct-fit replacement for the ICP unit WPG3304040LKC1 and the shared Heil, Tempstar, Comfortmaker, and Keeprite chassis. Confirm part number 1178417 and the original switch trip setpoint before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and disconnect; verify zero voltage with a multimeter.
2. Access — Remove the control/burner access panel.
3. Document — Photograph the two spade terminals and the sensing tube routing before disconnecting.
4. Remove — Pull the wire terminals, slip off the rubber tube, and remove the mounting screws.
5. Install — Mount the new switch, reattach the tube without kinks, and reconnect the terminals per your photo.
6. Test — Restore power and run a heat cycle; confirm the inducer pulls the switch closed and the burners light.

Signs You Need a Replacement

• Inducer motor runs but burners never ignite
• Furnace locks out with a pressure-switch fault code
• Switch fails a continuity test once the inducer is at full draft
• Cracked, brittle, or disconnected sensing tube

Shipping & Returns

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