ICP Pressure Switch for WPG4424090RKA1 — OEM w/ Tubing | Ships Today

Overview

This OEM pressure switch with tubing (Part No. 1178417) is the safety device that confirms proper draft inducer airflow before the burners in your ICP WPG4424090RKA1 are allowed to fire. The switch senses negative pressure created by the inducer through its tubing; only when correct pressure is proven does it close and let the ignition sequence continue. If the venting is blocked, the inducer is weak, or the switch itself fails, it stays open and the control board locks out the furnace to prevent unsafe combustion. Replacing a faulty switch with the genuine OEM part restores the correct pressure setpoint and safe operation.

Specifications

Compatibility

Designed for the ICP / Tempstar / Heil WPG4424090RKA1 packaged gas-electric unit and related ICP-family furnaces using this pressure switch and tubing assembly. Match the switch part number and pressure setpoint to your existing unit before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker, shut off the gas, and verify zero voltage with a multimeter.
2. Access — Remove the burner/inducer compartment service panel.
3. Document — Photograph the switch wiring and tubing routing before removal.
4. Remove — Disconnect the electrical terminals, slip off the tubing, and unscrew the old switch.
5. Install — Mount the new switch, reattach the tubing without kinks, and reconnect the wiring per your photo.
6. Test — Restore gas and power, start a heat cycle, and confirm the switch closes and the burners fire normally.

Signs You Need a Replacement

• Furnace locks out and won't ignite
• Inducer runs but burners never light
• Control board flashes a pressure switch fault code
• Switch fails to close with verified good draft

Shipping & Returns

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