ICP Pressure Switch for WPG4304060LKB1 — Tubing-Style OEM 1178417 | Ships Today
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Overview
This is a genuine OEM tubing-style air pressure switch (part number 1178417) for the ICP/Heil/Tempstar WPG4304060LKB1 packaged gas furnace. The pressure switch is a critical safety control that verifies proper combustion airflow before the ignition sequence begins. It monitors negative pressure created by the inducer (draft) motor through a small length of tubing. When adequate draft is sensed, the normally-open contacts close and allow the control board to energize the igniter and gas valve. If the switch never closes — or opens during a heating cycle — the furnace locks out to prevent unsafe operation. A failed or drifting pressure switch is one of the most common causes of a furnace that cycles, short-cycles, or refuses to ignite.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Tubing Pressure Switch (Air-Proving) |
| Brand | ICP / Heil / Tempstar / Comfortmaker |
| Function | Combustion airflow / draft proving |
| Contacts | Single-pole, normally open |
| Fitment | OEM exact-fit for WPG4304060LKB1 |
Compatibility
Designed as a direct OEM replacement for the ICP/Heil/Tempstar WPG4304060LKB1 packaged unit. This switch is also used across closely related WPG-series furnaces sharing the same inducer and venting assembly. Always confirm the part number stamped on your existing switch matches 1178417 before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the furnace control/blower access panel.
- Document — Photograph the wire terminals and the tubing connection before disconnecting anything.
- Remove — Pull the spade terminals off the old switch, detach the rubber sensing tube, and remove the mounting screws.
- Install — Mount the new 1178417 switch, reconnect the tubing (no kinks), and reattach the wires per your photo.
- Test — Restore power and start a heat call; confirm the inducer runs and the switch closes for normal ignition.
Signs You Need a Replacement
- Furnace inducer runs but the igniter never glows
- Repeated lockouts or flashing pressure-switch fault codes
- Short-cycling on the heating call
- Switch fails a continuity/closure test when 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