ICP Tubing Pressure Switch for WPG3604130LKC1 — OEM 1178417 | Ships Today
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Overview
This genuine ICP air pressure switch (OEM part number 1178417) is the safety device that confirms proper combustion-air and venting flow before your furnace or packaged unit allows ignition. It is a normally-open, single-pole switch with an integrated sensing tube that monitors the negative pressure created by the inducer/draft motor. When the inducer pulls the correct vacuum, the diaphragm closes the contacts and signals the control board that it is safe to energize the igniter and open the gas valve. A failed switch will not close, will not prove flow, and will lock the unit out on a no-heat fault. This is the exact OEM pressure switch fitted to the ICP / Tempstar / Heil model WPG3604130LKC1.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1178417 |
| Description | Tubing Pressure Switch |
| Type | Air / Combustion Proving Switch |
| Brand | ICP (Tempstar / Heil) |
| Configuration | Single-pole, normally open |
| Includes | Sensing tubing |
| Fits Model | WPG3604130LKC1 |
Compatibility
Engineered as a direct OEM replacement for the ICP / Tempstar / Heil packaged unit WPG3604130LKC1. ICP-family equipment (Comfortmaker, Arcoaire, KeepRite, Day & Night) shares many components, but always match the exact OEM number 1178417 and the switch's pressure set point before installing.
Installation Guide
- Safety First — Disconnect power at the unit disconnect or breaker and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the blower/control compartment service panel.
- Document — Photograph the two spade terminals and the sensing tube routing before disconnecting anything.
- Remove — Pull the sensing tube off the port, disconnect the wire leads, and remove the mounting screws holding the old switch.
- Install — Mount the new switch, reconnect the wire leads, and reattach the sensing tube to the correct port, ensuring no kinks or moisture traps.
- Test — Restore power and start a heat call; confirm the inducer runs, the switch proves, and ignition completes without lockout.
Signs You Need a Replacement
- Furnace inducer runs but the unit never ignites (no-heat lockout).
- Control board flashes a pressure-switch or open-circuit fault code.
- Short cycling or repeated retries on a heat call.
- Cracked, blocked, or disconnected sensing tube and a switch that won't close.
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days