ICP Pressure Switch for WPG4364060LKA1 — OEM 1178417 | Ships Today

Overview

This OEM pressure switch assembly (part 1178417, includes tubing) is the direct-fit draft-proving safety control for the ICP/Tempstar/Heil WPG4364060LKA1 packaged gas furnace. The switch verifies that the inducer is moving combustion air before the control board allows the igniter and gas valve to fire. A failed switch, blocked tubing, or a stuck contact prevents ignition entirely. Symptoms include the inducer running but burners never lighting, repeated lockouts, and pressure-switch fault codes at the control board.

Specifications

Compatibility

Built as a factory replacement for the ICP/Tempstar/Heil WPG4364060LKA1 packaged gas system. Confirm the trip set-point and port configuration against part 1178417 before installing.

Installation Guide

1. Safety First — Disconnect power and gas; verify zero voltage with a multimeter.
2. Access — Remove the furnace service panel.
3. Document — Photograph the wiring and tubing routing before disconnecting.
4. Remove — Pull the spade terminals, detach the hose, and remove the mounting screws.
5. Install — Mount the new switch, connect the tubing without kinks, and reconnect the terminals per your photo.
6. Test — Restore power and gas, then run a heat cycle and confirm the inducer proves and burners light.

Signs You Need a Replacement

• Inducer runs but the furnace never ignites.
• Pressure-switch fault code flashing at the control board.
• Repeated ignition lockouts after a few cycles.
• Switch fails a continuity test when the inducer is running.

Shipping & Returns

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