ICP Tubing Pressure Switch for WPG4364090RKB1 — OEM 1178417 | Ships Today
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Overview
This is a genuine OEM tubing pressure switch (part number 1178417) for the ICP/Tempstar/Heil WPG4364090RKB1 packaged gas/electric unit. The pressure switch is a critical safety control that proves adequate combustion airflow and proper venting before the furnace ignition sequence is allowed to begin. It uses a sensing tube connected to the inducer/vent system; when the induced-draft blower establishes the correct negative pressure, the switch contacts close and signal the control board that it is safe to energize the igniter and open the gas valve. A failed or out-of-calibration switch is one of the most common causes of intermittent no-heat lockout calls.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Tubing / Air-Proving Pressure Switch |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Function | Combustion airflow / draft proving |
| Connection | Sensing tube + spade terminals |
| Fitment | OEM direct replacement |
Compatibility
Designed as a factory-exact replacement for the ICP WPG4364090RKB1 packaged unit and the related Tempstar, Heil, and Comfortmaker WPG-series gas/electric package equipment that originally shipped with part 1178417. Always verify the part number printed on your existing switch before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and thermostat, then verify zero voltage with a multimeter.
- Access — Remove the control/blower service panel on the unit.
- Document — Photograph the wiring and sensing-tube routing before disconnecting anything.
- Remove — Pull the spade terminals, slide off the rubber sensing hose, and unscrew the switch from its bracket.
- Install — Mount the new switch, reconnect the sensing tube with no kinks, and reattach the wires per your photo.
- Test — Restore power, start a heat cycle, and confirm the inducer proves and the burners light without lockout.
Signs You Need a Replacement
- Furnace inducer runs but burners never ignite (pressure switch lockout).
- Control board flashes a pressure-switch / draft fault code.
- Intermittent no-heat that clears after a reset.
- 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