ICP Pressure Switch for WPG4424090LKA1 — OEM 1178417 Tubing Pressure Switch | Ships Today

Overview

This is a genuine OEM tubing pressure switch (part number 1178417) for the ICP/Tempstar/Heil WPG4424090LKA1 packaged gas/electric unit. The pressure switch is a critical safety device that proves adequate combustion air flow before the control board allows the gas valve to open and the igniter to fire. It monitors the negative pressure created by the inducer/draft motor through its attached sensing tubing. If the switch does not close on a proven draft, the furnace section locks out to prevent unsafe ignition. A failed or drifting switch is one of the most common causes of intermittent no-heat calls.

Specifications

Compatibility

Engineered as a direct-fit replacement for the ICP/Tempstar/Heil/Comfortmaker WPG4424090LKA1 packaged unit. Because it is the OEM part, it matches the original set point, port size, and mounting so no field adaptation is required.

Installation Guide

1. Safety First — Disconnect power at the disconnect and verify zero voltage with a multimeter before opening the cabinet.
2. Access — Remove the service/control panel to reach the inducer and pressure switch.
3. Document — Photograph the wire terminals and the tubing routing before disconnecting anything.
4. Remove — Pull the two switch wires, disconnect the sensing tube, and unscrew the old switch from its bracket.
5. Install — Mount the new switch, reconnect the tubing without kinks, and re-land the wires per your photo.
6. Test — Restore power, start a heat cycle, and confirm the switch closes on a proven draft and the burners light.

Signs You Need a Replacement

• Furnace section locks out or short-cycles on a pressure/draft fault code
• Inducer runs but burners never light
• Switch chatters or fails to close with a confirmed clean tube and clear vent
• Cracked, brittle, or disconnected sensing tubing

Shipping & Returns

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