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OEM Carrier Pressure Switch 1.81
Carrier

OEM Carrier Pressure Switch 1.81" WC SPST for PG9MAA048080AFKA

SKU: CARRIE-PG9MAA048080AFKA-PRESSURE_SWITCH-HK06NB123 Brand: Carrier
✓ Guaranteed to fit PG9MAA048080AFKA — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Furnace Pressure Switch 1.81" WC SPST for Model PG9MAA048080AFKA

This OEM-spec pressure switch is the factory-matched replacement for the Carrier PG9MAA048080AFKA gas furnace, carrying part number HK06NB123. The pressure switch is a critical safety interlock that monitors inducer motor draft before allowing ignition to proceed. When the inducer creates the correct negative pressure in the flue, the switch closes and signals the control board to advance the ignition sequence. A failed pressure switch will cause the furnace to lock out on a fault code before the igniter ever fires — leaving you with a cold house and a blinking LED error code.

  • Specs: 1.81" WC (inches water column) setpoint | SPST (single-pole, single-throw) configuration | Standard 3/16" hose port and quick-connect terminals | Factory-matched switching accuracy
  • OEM vs Generic: OEM pressure switches are calibrated to the exact setpoint for your furnace's inducer. Off-spec generic switches can trip too early or too late, causing nuisance lockouts or — more dangerously — allowing operation under improper draft conditions.
  • Install difficulty: 2/5 — Power off the furnace at the breaker and gas shutoff before starting. Tools needed: flathead screwdriver, needle-nose pliers, and a short length of replacement tubing if the existing hose is cracked. Always inspect the rubber hose connected to the switch — a cracked hose is often the real culprit and costs under $1 to replace.
  • Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PG9MAA048080AFKA 80% AFUE gas furnace. Note that OEM part HK06NB123 has been superseded by HK06NB124 — both maintain the same 1.81" WC specification and are functionally identical. Verify your existing switch's WC rating on the data plate or switch body before ordering. Not sure it fits? Contact our team for free fitment verification before you buy — we confirm compatibility on every order.

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 PG9MAA048080AFKA?
Yes. This is the factory-specified OEM pressure switch for the Carrier PG9MAA048080AFKA. 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 PG9MAA048080AFKA?
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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