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OEM Carrier Pressure Switch 1.81
Carrier

OEM Carrier Pressure Switch 1.81" WC SPST for PG9MAA048100AFKA

SKU: CARRIE-PG9MAA048100AFKA-PRESSURE_SWITCH-HK06NB123 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier Pressure Switch 1.81" WC SPST for Model PG9MAA048100AFKA

This OEM pressure switch (part number HK06NB123) is the factory-specified inducer proving switch for the Carrier PG9MAA048100AFKA gas furnace. The pressure switch monitors the negative pressure (vacuum) created by the draft inducer motor before allowing the control board to advance to the ignition sequence. When the switch fails — or the inducer fails to develop adequate draft — the furnace locks out before a single spark fires, protecting the heat exchanger and flue system from dangerous backdrafting. Common failure symptoms include a furnace that starts the inducer but never advances to ignition, a blinking fault code indicating a "pressure switch open" error, or a furnace that short-cycles immediately on a call for heat.

  • Specs: 1.81" WC (inches water column) setpoint | SPST (single-pole, single-throw) configuration | Two wiring terminals | Two hose ports | Factory-matched switching accuracy
  • OEM vs Generic: This OEM switch is calibrated to the exact 1.81" WC trip point required by the Carrier PG9MAA048100AFKA. Generic pressure switches with ±5–10% tolerance can cause nuisance lockouts in cold weather or, worse, allow operation under insufficient draft — a combustion safety risk.
  • Install Difficulty: 2/5 — Shut off power and gas before beginning. Tools needed: 1/4" nut driver, small flathead screwdriver, and a manometer (recommended to verify draft after install). Disconnect the rubber hose and two wire terminals, swap the switch, and re-verify operation on the next heat call.
  • Warranty & Shipping: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse — order before 3 PM local time for next-day delivery eligibility.

Compatibility: Designed for the Carrier PG9MAA048100AFKA gas furnace. Note that OEM part HK06NB123 has been superseded by HK06NB124 — both share the same 1.81" WC specification and are functionally identical for this application. Always verify the WC rating on your existing switch's label before ordering. Our fitment team is available to confirm compatibility before you place your 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 PG9MAA048100AFKA?
Yes. This is the factory-specified OEM pressure switch for the Carrier PG9MAA048100AFKA. 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 PG9MAA048100AFKA?
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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