OEM Carrier Pressure Switch HK02ZB044 for Model PY1REA090180ACWA

This OEM pressure switch (part number HK02ZB044) is the factory-specified replacement for the Carrier PY1REA090180ACWA system. The pressure switch monitors the negative pressure (draft) created by the inducer motor to verify safe venting conditions before allowing the ignition sequence to proceed. When the switch fails or the sensing port becomes clogged, the control board cannot confirm inducer operation and the furnace will lock out — typically before the igniter ever glows. Common symptoms include a flashing fault code indicating a pressure switch error, a system that attempts to start and immediately shuts down, or a unit that runs the inducer but never advances to ignition.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" lead wires | 24V rated | Made in Mexico — exact OEM factory specification
• OEM vs Generic: This is a genuine Carrier OEM switch, manufactured to exact design tolerances. Aftermarket pressure switches frequently carry wider setpoint tolerances that can cause nuisance lockouts or, worse, unsafe operation by failing to detect a blocked flue condition.
• Install difficulty: 2/5 — Tools needed: 1/4" nut driver, small flathead screwdriver, and a manometer (recommended to verify W.C. reading after replacement). Always confirm inducer port and pressure tubing are clear of debris before installing the new switch. Power down the unit before beginning work.
• Warranty: 1-year OEM factory warranty. Ships same business day on all in-stock orders placed before cutoff.

Compatibility: Engineered and factory-matched for Carrier model PY1REA090180ACWA. Verify your unit's existing switch PSI setpoints and lead length against your data plate before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence.