ICP Pressure Switch for WPG4244040LKB1 — OEM Furnace Switch with Tubing | Ships Today
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Overview
This OEM pressure switch assembly with tubing is the direct-fit air-proving safety control for the ICP / Heil / Tempstar / Comfortmaker WPG4244040LKB1 furnace. It senses negative pressure created by the inducer (draft) blower and proves adequate venting before the control board allows the gas valve to open and the igniter to fire. Covered OEM part number: 1178417 (Tubing Pressure Switch). If the switch sticks open, has a cracked or blocked hose, or a contaminated diaphragm, the furnace will lock out on a pressure-switch fault and refuse to ignite — a critical safety function that prevents firing into a blocked flue. Replacing the switch and its tubing restores reliable, safe ignition.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Air-Proving Pressure Switch (with tubing) |
| Brand | ICP / Heil / Tempstar / Comfortmaker |
| Function | Draft / Vent Safety Proving |
| Application | Gas Furnace |
| Fit | OEM Direct Replacement |
Compatibility
Designed for the WPG4244040LKB1 and shared across matching ICP-built furnaces sold under the Heil, Tempstar, Comfortmaker, and Arcoaire badges. Match the switch set-point and port configuration against the failed unit before ordering.
Installation Guide
- Safety First — Disconnect power at the switch and breaker; verify zero voltage with a multimeter and shut off the gas.
- Access — Remove the burner/inducer compartment service panel.
- Document — Photograph the hose routing and the two electrical terminals before disconnecting.
- Remove — Pull the tubing off the inducer port, disconnect the spade terminals, and unscrew the old switch.
- Install — Mount the new switch, route the new tubing without kinks, and reconnect the terminals per your photo.
- Test — Restore gas and power, start a heat cycle, and confirm the switch closes and the burners light normally.
Signs You Need a Replacement
- Furnace locks out with a pressure-switch fault code
- Inducer runs but ignition never starts
- Cracked, brittle, or clogged sensing tubing
- Switch fails to close even with a clear vent and good draft
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