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OEM Carrier High Pressure Switch HK02ZA442 for FIOP300C501GA
Carrier

OEM Carrier High Pressure Switch HK02ZA442 for FIOP300C501GA

SKU: CARRIE-FIOP300C501GA-PRESSURE_SWITCH-HK02ZA442 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier High Pressure Switch HK02ZA442 for Model FIOP300C501GA

This is the OEM factory-specified high pressure switch (part number HK02ZA442) for the Carrier FIOP300C501GA unit. The pressure switch is a critical safety component that monitors the inducer motor's ability to create proper draft before allowing the ignition sequence to proceed. When the switch detects insufficient negative pressure — due to a blocked flue, failed inducer motor, cracked hose, or a faulty switch itself — it interrupts the ignition sequence and puts the system into lockout. Common symptoms of a failed pressure switch include the furnace or air handler refusing to advance past the inducer stage, repeated fault codes related to pressure or draft proving, and a system that attempts ignition but immediately locks out.

  • Specs: High pressure switch | OEM part number HK02ZA442 | Factory-calibrated W.C. (water column) rating | Direct plug-in wiring harness connector for tool-free electrical connection
  • OEM vs Generic: This OEM switch is factory-calibrated to the exact water column rating required by the FIOP300C501GA. Aftermarket pressure switches often carry wider tolerances that can cause nuisance lockouts or — more dangerously — fail to trip when a true venting problem exists.
  • Install Difficulty: 2/5 — Shut off power and gas before beginning. Tools needed: flathead screwdriver, needle-nose pliers, and a digital manometer (recommended to verify W.C. after install). Photograph all hose and wiring connections before removal. Swap hoses one at a time to avoid mis-routing.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FIOP300C501GA. Always cross-reference the W.C. rating stamped on your existing switch with the HK02ZA442 spec sheet to confirm fitment on variant configurations. Our HVAC parts specialists are available to verify compatibility before you order — reach out before placing your order if you have any questions. Order today and receive same-day shipping on all in-stock parts.

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

Frequently Asked Questions

Does this Pressure Switch fit my Carrier FIOP300C501GA?
Yes. This is the factory-specified OEM pressure switch for the Carrier FIOP300C501GA. 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 Carrier FIOP300C501GA?
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 Carrier 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 Carrier 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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