ICP Pressure Switch for WPG3484090RKC1 — OEM Tubing Pressure Switch | Ships Today
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Overview
This genuine OEM tubing pressure switch (part number 1178417) is a safety control for the ICP / Tempstar / Heil model WPG3484090RKC1 furnace. The pressure switch confirms that the inducer draft motor is moving combustion gases properly before the control board allows the igniter and gas valve to fire. It senses negative pressure through its connected tubing and closes to prove draft. If the switch fails, sticks open, or the tubing clogs with condensate, the furnace will not ignite — a deliberate safety lockout that prevents dangerous flue-gas conditions. Replacing a faulty switch with the correct OEM part restores reliable ignition without defeating the safety circuit.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Tubing Pressure Switch |
| Brand | ICP / Tempstar / Heil |
| Function | Draft / Combustion Air Proving |
| Application | Gas Furnace |
| Fitment | OEM |
Compatibility
A direct-fit replacement for the ICP, Tempstar, and Heil model WPG3484090RKC1 and related furnaces. Pressure switches are calibrated to a specific trip point — always match the part number and rating to your original switch before installing.
Installation Guide
- Safety First — Turn off the gas and disconnect electrical power, then verify zero voltage with a multimeter.
- Access — Remove the furnace access panel to reach the switch and inducer assembly.
- Document — Photograph the wire terminals and tubing connection before disconnecting.
- Remove — Pull the tubing off the port, disconnect the spade terminals, and remove the mounting screws.
- Install — Mount the new switch, reconnect the wires and tubing per your photo, and confirm the tubing has no kinks or trapped condensate.
- Test — Restore gas and power, call for heat, and confirm the inducer runs and the burners light.
Signs You Need a Replacement
- Furnace inducer runs but burners never light
- Control board flashes a pressure-switch fault code
- Switch chatters or fails to close on a call for heat
- Furnace short-cycles or locks out intermittently
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