ICP Tubing Pressure Switch for WPG3604115LKC1 — Furnace Safety | Ships Today
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Overview
This genuine OEM tubing pressure switch (ICP part 1178417) is the combustion-air safety on your ICP / Tempstar / Heil WPG3604115LKC1 packaged gas-electric unit. When the draft inducer starts on a heat call, it pulls a vacuum on the switch through its sensing tube. If adequate draft is proven, the switch closes and signals the control board that it's safe to energize the igniter and gas valve. This protects against blocked flue, cracked heat exchanger draft loss, or a failed inducer by preventing ignition when proper venting can't be confirmed. The switch and its tubing are a frequent no-heat culprit — a stuck-open switch, clogged sensing port, or cracked tube blocks the ignition sequence even when everything else is healthy.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1178417 |
| Type | Tubing Air Pressure / Draft Switch |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Control Circuit | 24V Low Voltage |
| Function | Combustion Air / Inducer Draft Proving |
| Fitment | OEM Direct Replacement |
Compatibility
Direct OEM replacement for the ICP / Tempstar / Heil WPG3604115LKC1 packaged gas-electric unit and compatible ICP-family heating sections using pressure switch 1178417. Match the trip setpoint (in. w.c.) stamped on the old switch before ordering.
Installation Guide
- Safety First — Disconnect power at the unit disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the control/inducer access panel.
- Document — Photograph the switch wiring and the sensing tube routing before removal.
- Remove — Pull the spade terminals and the sensing hose, then unscrew the switch from its bracket.
- Install — Mount the new switch, reconnect the wiring, and seat the sensing tube fully with no kinks or cracks.
- Test — Restore power, start a heat call, and confirm the inducer proves draft and the burners light.
Signs You Need a Replacement
- No heat — inducer runs but the board never advances to ignition.
- Switch fails to close (or won't open) when tested with a manometer/meter.
- Cracked, brittle, or condensate-blocked sensing tubing.
- Intermittent lockouts that clear after the inducer cycles.
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