ICP Tubing Pressure Switch for WPG3244040LKC1 — Furnace Safety Limit | Ships Today

Overview

This is an OEM tubing-style air pressure switch (Part No. 1178417) for the ICP / Tempstar / Heil WPG3244040LKC1 packaged gas unit. The pressure switch is a critical combustion safety device. When the inducer (draft) motor starts, it pulls a vacuum through a small sensing tube connected to this switch. If — and only if — the switch senses adequate negative pressure (proper venting), its internal contacts close and allow the control board to energize the igniter and open the gas valve. If the vent is blocked, the inducer is weak, or condensate has clogged the drain, the switch stays open and locks out the burners to prevent a dangerous condition.

Common failure symptoms include the furnace inducer running but the burners never lighting, a short-cycling burner that drops out under load, or a flashing fault code indicating an open or stuck pressure switch. A cracked sensing tube, a corroded diaphragm, or a switch that has lost its calibration will all trigger these faults.

Specifications

Compatibility

Designed as a direct OEM replacement for the ICP / Tempstar / Heil WPG3244040LKC1 packaged gas/electric unit and related WPG-series cabinets that use part 1178417. Always confirm the printed part number on your existing switch before ordering, as pressure switch set points are model-specific.

Installation Guide

1. Safety First — Disconnect power at the unit disconnect and verify zero voltage at the control board with a multimeter before touching any wiring.
2. Access — Remove the blower/control access panel to expose the inducer assembly and pressure switch.
3. Document — Photograph the wiring and the sensing tube routing before disconnecting anything.
4. Remove — Pull the two spade terminals off the switch, slide the rubber sensing tube off the port, and remove the two mounting screws.
5. Install — Mount the new switch, reconnect the sensing tube firmly (no kinks or cracks), and reattach the spade terminals per your photo.
6. Test — Restore power, start a heat call, and confirm the inducer runs, the switch closes, and the burners light and stay lit.

Signs You Need a Replacement

• Inducer motor runs but burners never ignite.
• Furnace short-cycles or drops out shortly after ignition.
• Control board reports an open or stuck-closed pressure switch fault.
• Visible cracking, corrosion, or a brittle/split sensing tube.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.