What are the specs for this Pressure Switch?

The correct replacement for ICP model WPG4484090RKB1 — Tubing Included | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your ICP equipment which lists the model number WPG4484090RKB1 — Tubing Included | Ships Today.

ICP

ICP Pressure Switch for WPG4484090RKB1 — Tubing Included | Ships Today

Name: ICP Pressure Switch for WPG4484090RKB1 — Tubing Included | Ships Today
Brand: ICP
SKU: 1178417
Price: 42.84 USD
Availability: InStock

SKU: 1178417 Brand: ICP

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Overview

This genuine OEM pressure switch with tubing (part #1178417) is the combustion-air safety device on the ICP/Tempstar/Heil WPG4484090RKB1 packaged gas/electric unit. When the induced-draft blower starts, it creates a negative pressure that the switch senses through its tubing; only when the correct draft is proven does the switch close and allow the control board to energize the igniter and gas valve. This prevents the burners from firing if the vent is blocked, the inducer has failed, or the heat exchanger is restricted. A switch that is stuck open, has cracked or clogged tubing, or has drifted out of calibration causes ignition lockouts and no-heat conditions. Replacing it with the correct OEM switch and tubing restores reliable proof-of-draft safety.

Specifications

Spec	Value
Part Number	1178417
Type	Air Pressure / Proof-of-Draft Switch
Brand	ICP / Tempstar / Heil
Includes	Sensing Tubing
Application	Furnace / Gas Heat Section
Fits Model	WPG4484090RKB1

Compatibility

Direct factory replacement for the ICP, Tempstar, Heil, and Comfortmaker WPG4484090RKB1 packaged unit. Match the pressure set-point stamp and port configuration on your existing switch before installing — using the wrong set point defeats the safety function.

Installation Guide

Safety First — Disconnect power and shut off the gas, then verify zero voltage with a multimeter.
Access — Remove the control/burner service panel to reach the switch.
Document — Photograph the wire terminals and tubing routing before disconnecting.
Remove — Pull the spade terminals, detach the tubing, and unscrew the old switch from its bracket.
Install — Mount the new switch, route the new tubing without kinks, and reconnect the leads per your photo.
Test — Restore power and gas, run a heat cycle, and confirm the switch proves draft and the burners light.

Signs You Need a Replacement

Furnace locks out and shows a pressure-switch fault code
Inducer runs but burners never ignite
Cracked, brittle, or clogged sensing tubing
Switch fails to close even with proper draft confirmed

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

ICP Pressure Switch for WPG44840...

$42.84

Frequently Asked Questions

Does this Pressure Switch fit my ICP WPG4484090RKB1 — Tubing Included | Ships Today?

Yes. This is the factory-specified OEM pressure switch for the ICP WPG4484090RKB1 — Tubing Included | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the pressure switch on my ICP WPG4484090RKB1 — Tubing Included | Ships Today?

Difficulty: Medium (20–30 min)
Step 1: Turn off power. Step 2: Locate pressure switch near draft inducer. Step 3: Note tubing orientation. Step 4: Disconnect tubing and wires. Step 5: Remove screw, install new switch. Step 6: Reconnect tubing and wires, restore power.

My furnace shows a pressure switch error. What do I replace?

Furnace LED showing pressure switch error = switch not detecting draft inducer airflow. Try first: clear the rubber tubing to the switch (often clogged with condensation). If problem persists, replace the pressure switch.

Is this pressure switch compatible with Bryant or Payne too?

Many ICP parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my ICP pressure switch?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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