ICP Tubing Pressure Switch for WPG3364090LKC1 – OEM 1178417 | Ships Today
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Overview
This is a genuine OEM air pressure switch (tubing pressure switch, part number 1178417) for the ICP Tempstar Heil WPG3364090LKC1 packaged gas furnace. The pressure switch is a critical safety device that confirms the inducer draft motor is moving combustion air before the ignition sequence is allowed to begin. It senses the negative pressure created by the draft inducer through a small rubber hose and closes its electrical contacts only when adequate airflow is proven. If the switch fails to close, the control board locks out ignition to prevent unsafe operation. Common failure symptoms include a furnace that runs the inducer motor but never lights, repeated lockouts, a clicking relay, or a unit that short-cycles on a call for heat. A cracked hose, a clogged port, or worn contacts inside the switch will all produce the same no-heat condition.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Tubing / Air Proving Pressure Switch |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Function | Draft / Combustion Air Proving |
| Connection | Hose port with single-pole contacts |
| Fit | Genuine OEM Replacement |
Compatibility
Engineered as a direct-fit OEM replacement for the ICP Tempstar Heil WPG3364090LKC1 packaged gas unit. ICP shares this platform across its Tempstar, Heil, Comfortmaker, and Arcoaire family, so this switch may also service closely related WPG-series models. Always verify your existing part number (1178417) against the switch you are removing before installing.
Installation Guide
- Safety First – Disconnect power at the unit disconnect and verify zero voltage with a multimeter before opening any panel.
- Access – Remove the furnace control/blower service panel to expose the inducer assembly and switch.
- Document – Photograph the wire terminals and the hose routing before disconnecting anything.
- Remove – Pull the rubber sensing hose off the port, slide the spade connectors off the terminals, and unscrew the switch from its bracket.
- Install – Mount the new 1178417 switch, reconnect the spade terminals per your photo, and firmly seat the sensing hose on the port.
- Test – Restore power, start a heat call, and confirm the inducer runs, the switch closes, and the burners light and stay lit.
Signs You Need a Replacement
- Inducer motor runs but the furnace never ignites
- Furnace locks out and displays a pressure-switch fault code
- Short-cycling or repeated failed ignition attempts
- Switch contacts test open even with the inducer running and hose clear
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