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OEM Carrier High Pressure Switch HK02ZA442 for FIOP300501GA
Carrier

OEM Carrier High Pressure Switch HK02ZA442 for FIOP300501GA

SKU: CARRIE-FIOP300501GA-PRESSURE_SWITCH-HK02ZA442 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier High Pressure Switch HK02ZA442 for Model FIOP300501GA

This OEM high pressure switch (part number HK02ZA442) is the factory-specified replacement for the Carrier FIOP300501GA unit. The pressure switch is a critical safety component in the combustion air proving circuit — it monitors the negative pressure (draft) created by the inducer motor to verify safe venting conditions before allowing the control board to initiate ignition. When this switch fails or sticks open, the furnace will typically lock out before reaching the ignition stage, leaving you with a no-heat condition and often a diagnostic fault code related to pressure switch failure.

  • Specs: High pressure switch | OEM part number HK02ZA442 | 24V control circuit compatible | Factory-calibrated W.C. (water column) setpoint matched to FIOP300501GA inducer specifications — always verify rating on existing switch before ordering
  • OEM vs Generic: This is a genuine Carrier OEM pressure switch manufactured to exact factory setpoint tolerances. Aftermarket switches frequently carry wider W.C. tolerances that can cause nuisance lockouts or, worse, fail to detect a true venting fault — making OEM the only safe choice for this safety-critical component.
  • Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: flathead screwdriver, needle-nose pliers, multimeter (continuity test). Inspect the rubber tubing connected to the switch port for cracks or blockages before condemning the switch itself, as blocked tubing is a common cause of pressure switch faults.
  • Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier FIOP300501GA. Confirm the W.C. rating stamped on your existing pressure switch matches this replacement prior to installation. If you are unsure of your unit's exact pressure switch specification, our HVAC parts team can verify fitment using your full model and serial number before you order. In stock and ready to ship today — get your system back online fast.

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 FIOP300501GA?
Yes. This is the factory-specified OEM pressure switch for the Carrier FIOP300501GA. 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 FIOP300501GA?
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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Mike Rivera
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