ICP Tubing Pressure Switch for WPG4484090LKB1 — OEM 1178417 | Ships Today
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Overview
This is a genuine OEM air pressure switch (part number 1178417) with integrated tubing for the ICP Tempstar Heil WPG4484090LKB1 packaged gas unit. The pressure switch is a safety device that confirms proper draft and combustion airflow through the inducer before the control board allows the gas valve to open and the igniter to fire. It monitors negative pressure created by the inducer motor through a small sensing tube. When airflow is correct, the switch closes and the ignition sequence proceeds; if the vent is blocked, the inducer is weak, or there is a condensate blockage, the switch stays open and locks out the furnace to prevent unsafe operation. Common failure symptoms include the inducer running but no ignition, repeated lockouts, or a furnace that short-cycles on call for heat.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Air/Draft Pressure Switch with Tubing |
| Brand | ICP (Tempstar / Heil) |
| Function | Inducer draft proving safety switch |
| Includes | Sensing tubing |
| Fit | OEM direct replacement |
Compatibility
Designed as a direct-fit OEM replacement for the ICP Tempstar Heil WPG4484090LKB1 packaged gas furnace/unit. ICP-built equipment is sold under multiple labels (Tempstar, Heil, Comfortmaker, Arcoaire), so this switch may also service equivalent models within that family. Verify the printed part number 1178417 on your existing switch before ordering.
Installation Guide
- Safety First — Disconnect power to the unit at the disconnect or breaker and verify zero voltage with a multimeter.
- Access — Remove the service/control panel to expose the inducer assembly and pressure switch.
- Document — Photograph all wire connections and the tubing routing before disconnecting.
- Remove — Pull the spade terminals off the old switch, detach the sensing tube from the inducer port, and unscrew the mounting screws.
- Install — Mount the new switch, reconnect the tubing to the inducer port, and reattach the electrical terminals exactly as photographed.
- Test — Restore power, call for heat, and confirm the inducer starts and the switch closes to allow ignition.
Signs You Need a Replacement
- Inducer motor runs but the unit never ignites.
- Furnace locks out or trips on a pressure/draft fault code.
- Cracked, kinked, or disconnected sensing tubing.
- Switch fails a continuity test when proper draft is present.
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