ICP Pressure Switch for WPG3484090LKC1 — OEM with Tubing | Ships Today

Overview

This OEM tubing pressure switch (part number 1178417) is the combustion safety control on your ICP/Tempstar/Heil WPG3484090LKC1 packaged gas/electric unit. It senses the negative draft created by the inducer motor through its sensing tube; once adequate airflow is proven, the switch closes and allows the control board to proceed with igniter and gas valve operation. This prevents the burners from firing without proper venting. When the switch, its tubing, or a port clogs or the diaphragm fails, the furnace stops on a pressure switch fault — the inducer runs but ignition never starts. Common causes include a cracked or blocked sensing tube, condensate-plugged ports, or a weak inducer.

Specifications

Compatibility

Direct OEM replacement for the pressure switch in the ICP/Tempstar/Heil WPG3484090LKC1 packaged gas/electric unit and compatible ICP-family equipment. Match the pressure setpoint, port count, and tubing connection to your existing switch.

Installation Guide

1. Safety First — Disconnect power and verify zero voltage with a multimeter.
2. Access — Remove the control/inducer access panel.
3. Document — Photo the switch wiring and tubing routing before removal.
4. Remove — Pull the spade terminals, disconnect the sensing tube, and unscrew the old switch.
5. Install — Mount the new switch, reconnect the tubing securely with no kinks, and reattach the wiring per your photos.
6. Test — Restore power, run a heat cycle, and confirm the switch proves draft and the unit ignites without a pressure fault.

Signs You Need a Replacement

• Inducer runs but the furnace never ignites
• Repeated pressure switch fault codes
• Switch stuck open or stuck closed when tested
• Cracked, brittle, or condensate-blocked sensing tubing

Shipping & Returns

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