ICP Pressure Switch with Tubing for WPG4304040LKB1 — OEM 1178417 | Ships Today

Overview

This OEM pressure switch with tubing (part number 1178417) is the factory replacement for the ICP / Tempstar / Heil WPG4304040LKB1. The pressure switch is a critical safety device that proves the draft inducer is moving combustion air and that the venting is clear before the control board allows the burners to light. The included tubing connects the switch to the inducer port and reads the negative pressure it generates. When the switch fails, sticks, or the tubing cracks or clogs, the furnace will not ignite, locks out, or short cycles — even when the inducer is running fine. Replacing it with the correct OEM part restores safe, reliable ignition sequencing.

Specifications

Compatibility

A direct OEM fit for the ICP / Tempstar / Heil WPG4304040LKB1 packaged gas furnace. The switch is calibrated to this model's inducer pressure specification, so it proves draft correctly without adjustment. Match the trip set point printed on your old switch before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the service panel to reach the pressure switch near the inducer assembly.
3. Document — Photo the wiring and tubing routing before disconnecting.
4. Remove — Slip off the tubing, disconnect the spade terminals, and unscrew the old switch.
5. Install — Mount the new switch, route the supplied tubing to the inducer port, and reconnect the wires per your photo.
6. Test — Restore power, call for heat, and confirm the switch closes and the burners light in proper sequence.

Signs You Need a Replacement

• Furnace inducer runs but burners never ignite
• Repeated pressure-switch lockout codes
• Short cycling on the heat call
• Cracked, brittle, or clogged sensing tubing

Shipping & Returns

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