ICP Tubing Pressure Switch for WPG4304040LKA1 — OEM 1178417 | Ships Today
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Overview
This is a genuine OEM tubing-style air-proving pressure switch (part number 1178417) for the ICP/Tempstar/Heil WPG4304040LKA1 packaged gas unit. The pressure switch monitors negative pressure created by the inducer/draft blower and proves adequate combustion airflow before the control board allows the gas valve and igniter to fire. It is a safety-critical interlock: if the switch does not close, the unit will not ignite, protecting against incomplete combustion and carbon monoxide. Common failure symptoms include the unit locking out on ignition, the inducer running but no flame, repeated short cycling, and diagnostic fault codes indicating an open pressure switch circuit.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Tubing Air-Proving Pressure Switch |
| Brand | ICP / Tempstar / Heil / Comfortmaker |
| Function | Draft/combustion airflow proving |
| Connection | Spade terminals with sensing tube |
| Fitment | OEM direct replacement |
Compatibility
Engineered as a direct-fit OEM replacement for the ICP family WPG4304040LKA1 packaged gas/electric unit and related Tempstar, Heil, and Comfortmaker models that share this combustion air-proving design. Always match the OEM part number 1178417 to confirm the correct pressure set point.
Installation Guide
- Safety First — Disconnect power at the disconnect and verify zero voltage with a multimeter.
- Access — Remove the control/blower access panel.
- Document — Photograph the wiring and tubing routing before disconnecting.
- Remove — Pull the spade terminals, detach the sensing tube from the inducer port, and unscrew the switch from its bracket.
- Install — Mount the new switch, reconnect the sensing tube and spade terminals per your photo, ensuring the tube is free of cracks and condensate.
- Test — Restore power, start a heat cycle, and confirm the switch closes and the unit ignites normally.
Signs You Need a Replacement
- Inducer runs but the burner never ignites
- Furnace locks out with an open pressure switch fault code
- Short cycling on a call for heat
- Switch contacts stuck open or closed when tested with a meter
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