What are the specs for this Pressure Switch?

The correct replacement for ICP model WPG4364090LKB1 — Furnace Safety Switch | 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 WPG4364090LKB1 — Furnace Safety Switch | Ships Today.

ICP

ICP Pressure Switch for WPG4364090LKB1 — Furnace Safety Switch | Ships Today

Name: ICP Pressure Switch for WPG4364090LKB1 — Furnace Safety Switch | Ships Today
Brand: ICP
SKU: 1178417
Price: 51.94 USD
Availability: InStock

SKU: 1178417 Brand: ICP

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Overview

This OEM pressure switch is the draft-proving safety control for the ICP/Heil/Tempstar WPG4364090LKB1 packaged gas furnace. It replaces OEM part 1178417 (TUBING PRESSURE SWITCH) and ships with its sensing tubing. The switch monitors negative pressure created by the inducer blower; only when it senses proper draft does it close and allow the ignition sequence to proceed. This prevents the furnace from firing if the inducer fails or the flue/vent is blocked, protecting against unsafe combustion.

Specifications

Spec	Value
OEM Part Number	1178417
Type	Air/Draft Pressure Switch (with tubing)
Brand	ICP (Heil / Tempstar / Comfortmaker)
Function	Inducer draft-proving safety
Application	Gas furnace combustion safety
Fitment	Direct OEM replacement

Compatibility

Direct-fit replacement for the ICP/Heil/Tempstar/Comfortmaker WPG4364090LKB1 packaged gas furnace and related units that shipped with OEM pressure switch 1178417. Match the switch's pressure rating (in. W.C.) and port configuration to your original before installing.

Installation Guide

Safety First — Shut off gas and disconnect power. Verify zero voltage at the switch terminals with a multimeter.
Access — Remove the furnace service panel to reach the inducer and switch.
Document — Photograph the wiring and tubing routing before disconnecting.
Remove — Pull the electrical terminals and sensing hose, then unscrew the old switch from its mounting bracket.
Install — Mount the new switch, reconnect the tubing (no kinks), and reattach the wiring per your photo.
Test — Restore gas and power, run a heat cycle, and confirm the switch closes and the furnace fires normally.

Signs You Need a Replacement

Furnace inducer runs but ignition never starts (open switch)
Repeated pressure-switch lockout fault codes
Short cycling on the heat call
Switch fails to close with verified good draft and clear tubing

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 WPG43640...

$51.94

Frequently Asked Questions

Does this Pressure Switch fit my ICP WPG4364090LKB1 — Furnace Safety Switch | Ships Today?

Yes. This is the factory-specified OEM pressure switch for the ICP WPG4364090LKB1 — Furnace Safety Switch | 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 WPG4364090LKB1 — Furnace Safety Switch | 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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