ICP Tubing Pressure Switch for WPG3604115RKC1 — OEM 1178417 | Ships Today

Overview

This genuine OEM tubing pressure switch (part number 1178417) is the safety device that proves proper draft and venting on the ICP/Tempstar/Heil WPG3604115RKC1. Connected by tubing to the inducer or vent, it senses negative pressure and closes its contacts to confirm the combustion air path is clear before the control allows ignition. A failed or stuck switch — or a blocked, cracked, or disconnected hose — prevents the furnace from firing as a safety lockout, even when every other component is healthy. Symptoms include the inducer running but the unit never lighting, or short-cycling on a pressure fault.

Specifications

Compatibility

Direct-fit OEM replacement for the ICP WPG3604115RKC1 packaged gas/electric unit and related Tempstar, Heil, and Comfortmaker furnaces using the same pressure-switch assembly. Verify the part number and pressure setpoint on your existing switch before ordering.

Installation Guide

1. Safety First — Disconnect power at the disconnect and thermostat, and verify zero voltage with a multimeter.
2. Access — Remove the furnace service panel to reach the inducer area.
3. Document — Photograph the wire terminals and tubing routing before disconnecting.
4. Remove — Pull the spade connectors, detach the sensing tubing, and unscrew the switch from its bracket.
5. Install — Mount the new switch, reconnect the tubing without kinks, and reattach the wiring per your photo.
6. Test — Restore power and run a heat cycle, confirming the inducer starts and the switch closes to allow ignition.

Signs You Need a Replacement

• Inducer runs but furnace never ignites
• Persistent pressure-switch fault or lockout codes
• Switch fails to close or open during cycle testing
• Short-cycling that clears when the switch is jumped (diagnostic only)

Shipping & Returns

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