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OEM Carrier Pressure Switch Kit HK02ZA395 & HK02ZB044 — PH2PNB042000AB
Carrier

OEM Carrier Pressure Switch Kit HK02ZA395 & HK02ZB044 — PH2PNB042000AB

SKU: CARRIE-PH2PNB042000AB-PRESSURE_SWITCH-HK02ZA395 Brand: Carrier
✓ Guaranteed to fit PH2PNB042000AB — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier High & Low Pressure Switch Set HK02ZA395 / HK02ZB044 for Model PH2PNB042000AB

This OEM pressure switch kit contains both the high-pressure safety switch (HK02ZA395) and the low-pressure switch (HK02ZB044) factory-specified for the Carrier PH2PNB042000AB heat pump. Together, these switches monitor refrigerant pressure on both the high and low sides of the refrigerant circuit. When either switch detects an out-of-range pressure condition, it opens the circuit and locks out the system to prevent compressor damage. Common failure symptoms include the unit going into lockout after startup, short-cycling within the first few minutes of operation, or a complete no-start condition with a pressure fault code on the thermostat or control board.

  • Specs — HK02ZA395 (High Pressure Switch): Opens at 395 PSI | Closes at 295 PSI | 1/8" NPT thread | 240 VAC | Sensata PS80-03-0018 platform | Replaces 312926-217, HK02ZA380, HK02ZA396, and related superseded part numbers
  • Specs — HK02ZB044 (Low Pressure Switch): Opens at 7 PSI | Closes at 22 PSI | 24V | 50" lead wire | OEM direct drop-in replacement | Made in Mexico
  • OEM vs Generic: OEM Carrier pressure switches are calibrated to exact factory cut-in/cut-out tolerances. Aftermarket alternatives frequently deviate from set-point specs, causing nuisance lockouts or, worse, allowing the compressor to operate outside safe pressure limits — risking costly compressor failure.
  • Install difficulty: 2/5 — Recover refrigerant per EPA 608 regulations before removing either switch from the refrigerant circuit. Tools needed: refrigerant recovery machine, manifold gauge set, 1" open-end wrench, thread seal tape, multimeter. Always verify pressure set points match unit data plate before installing. Replace both switches as a set when one fails to avoid a repeat call.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: This switch kit is factory-specified for the Carrier PH2PNB042000AB heat pump. Verify refrigerant type and pressure ratings on your unit's data plate before ordering. Our technical team is available to confirm fitment — contact us before you order if you have any questions. In stock and ready to ship today.

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 $99
  • 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 OEM Carrier Pressure Switch Kit HK02ZA395 & HK02ZB044 — PH2PNB042000AB?
Yes. This is the factory-specified OEM pressure switch for the Carrier OEM Carrier Pressure Switch Kit HK02ZA395 & HK02ZB044 — PH2PNB042000AB. 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 OEM Carrier Pressure Switch Kit HK02ZA395 & HK02ZB044 — PH2PNB042000AB?
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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