ICP Tubing Pressure Switch for WPG3304040RKC1 — OEM | Ships Today
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Overview
This genuine OEM tubing pressure switch (part number 1178417) is the safety/air-proving switch for the ICP / Tempstar / Heil WPG3304040RKC1 packaged furnace. It senses the negative pressure created by the inducer (draft) motor through its sensing tubing and proves that venting and combustion airflow are present before the control board allows the igniter and gas valve to energize. If the switch sticks, leaks, or its tubing clogs, the furnace will not advance past pre-purge and will lock out on a pressure fault — a critical safety interlock that prevents firing without proper venting. Installing the correct OEM switch restores reliable ignition sequencing while keeping the safety function intact.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Tubing Pressure / Air-Proving Switch |
| Brand | ICP (Tempstar / Heil) |
| Function | Proves inducer draft before ignition |
| Fits Model | WPG3304040RKC1 |
Compatibility
Built for the ICP WPG3304040RKC1 and shared across many Tempstar, Heil, Comfortmaker, and Day & Night packaged gas furnaces using this tubing-style pressure switch. Confirm the pressure set point and port/tubing configuration match your original switch.
Installation Guide
- Safety First — Disconnect power and verify zero voltage with a multimeter.
- Access — Remove the service panel to reach the pressure switch near the inducer assembly.
- Document — Photograph the electrical leads and the sensing tubing routing before disconnecting.
- Remove — Pull the spade terminals, slip off the sensing tube, and unscrew the old switch from its bracket. Inspect the tubing and ports for soot or condensate blockage.
- Install — Mount the new switch, reattach the tubing with no kinks, and reconnect the leads per your photo.
- Test — Restore power, start a heat cycle, and confirm the switch closes on inducer start-up and the furnace lights normally.
Signs You Need a Replacement
- Furnace locks out on a pressure-switch fault code
- Inducer runs but ignition never begins
- Switch contacts stick open or closed when tested
- Intermittent no-heat that clears on reset
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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