ICP Tubing Pressure Switch for WPG4244040RKB1 — 24V Furnace Safety Control | Ships Today
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Overview
This OEM tubing pressure switch (ICP part #1178417) is a 24-volt air-proving safety control used in ICP, Heil, Tempstar, and Comfortmaker WPG-series packaged gas/electric units. It monitors negative pressure in the induced-draft venting system and confirms the inducer motor is moving combustion air before the control board permits ignition. The switch connects to the inducer housing through a short length of sensing tubing and opens or closes a single set of contacts based on the pressure differential it reads. If proper draft is not established, the switch keeps its contacts open, the ignition sequence is blocked, and the furnace locks out — protecting the home from incomplete combustion and flue gas spillage. Common failure symptoms include a furnace that runs the inducer but never lights, repeated lockouts, a clicking relay with no flame, or a blocked/cracked sensing tube giving false pressure readings.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Tubing / Air-Proving Pressure Switch |
| Brand | ICP (Heil / Tempstar / Comfortmaker) |
| Control Voltage | 24V |
| Function | Inducer draft proving safety |
| Fitment | OEM replacement |
Compatibility
Engineered as the exact OEM replacement for the ICP/Tempstar/Heil WPG4244040RKB1 packaged gas/electric unit and shared across many WPG-series cabinets that use the same induced-draft assembly. Always confirm the part number stamped on your existing switch matches 1178417 before installing.
Installation Guide
- Safety First — Disconnect power at the unit disconnect and breaker, then verify zero voltage at the control with a multimeter.
- Access — Remove the unit's blower/control access panel.
- Document — Photograph the wire terminals and the sensing tube routing before disconnecting anything.
- Remove — Pull the two spade connectors off the old switch, disconnect the sensing tube, and remove the mounting screw(s).
- Install — Mount the new switch, reconnect the sensing tube fully seated, and reattach the wires per your photo.
- Test — Restore power and confirm the inducer starts, the switch closes, and the burners light on a heat call.
Signs You Need a Replacement
- Inducer runs but burners never ignite
- Furnace repeatedly locks out and retries
- Switch fails to close even with good draft (verified with manometer)
- Cracked, brittle, or clogged sensing tube
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