ICP Tubing Pressure Switch for WPG3424090LKC1 — OEM Draft Safety Switch | Ships Today
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Overview
This OEM tubing pressure switch (part number 1178417) is the air-proving safety device for the ICP Tempstar Heil WPG3424090LKC1 gas furnace. It monitors negative pressure created by the inducer/draft blower through its sensing tube and closes its contacts only when adequate venting airflow is confirmed. If the switch never proves, the control board locks out ignition to prevent unsafe combustion. A failed or clogged pressure switch is one of the most common causes of a furnace that ignites the inducer but never lights the burners. Typical failure symptoms include no heat with the inducer running, repeated short-cycling on a pressure fault, and ignition lockout codes flashed by the control board.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Tubing Pressure Switch (Draft/Inducer) |
| Brand | ICP / Tempstar / Heil |
| Fits Model | WPG3424090LKC1 |
| Function | Combustion air / draft proving safety |
| Fit | OEM Direct Replacement |
Compatibility
Designed as a direct-fit OEM replacement for the ICP Tempstar Heil WPG3424090LKC1 packaged unit. ICP-family brands (Comfortmaker, Heil, Tempstar, Arcoaire) frequently share this exact pressure switch assembly; always confirm the printed part number against the original.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker; verify zero voltage with a multimeter.
- Access — Remove the furnace/blower service panel.
- Document — Photograph the two wire leads and the sensing tube routing before disconnecting.
- Remove — Pull the sensing tube off the switch port, disconnect the spade terminals, and unscrew the switch from its bracket.
- Install — Mount the new switch, reconnect the spade terminals, and reseat the sensing tube fully onto the port.
- Test — Restore power, start a heat call, and confirm the inducer proves and the burners light without a pressure fault.
Signs You Need a Replacement
- Inducer runs but burners never ignite
- Furnace short-cycles or locks out on a pressure/draft fault code
- Switch contacts stuck open or stuck closed when tested with a meter
- Cracked switch body or a sensing port clogged with debris
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