OEM Carrier Low Pressure Switch 7 PSI Open / 22 PSI Close for Model PH1RPA120000AAWA

This is the genuine OEM Carrier replacement pressure switch (part number HK02ZB044) factory-specified for the Carrier PH1RPA120000AAWA packaged unit. The pressure switch is a critical safety component in the heating sequence: it monitors negative pressure (draft) created by the inducer motor and closes the circuit to allow ignition only when proper airflow is confirmed. When this switch fails or sticks open, the furnace will lock out before ignition, typically displaying a pressure switch fault code and preventing any heat delivery.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" wire leads | 24V control circuit | Country of Origin: Mexico | OEM Part Number: HK02ZB044
• OEM vs Generic: This is a factory OEM switch engineered to Carrier's exact pressure threshold tolerances. Generic switches frequently carry wider trip-point variance, risking nuisance lockouts or, more critically, failure to prove unsafe draft conditions — a safety hazard. OEM is always recommended for pressure switches.
• Install Difficulty: 2/5 — Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer (recommended to verify W.C. rating post-install). Always confirm inducer motor operation and check for blocked flue or condensate drain before replacing the switch — a failed inducer is the most common root cause of pressure switch faults.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as a direct OEM drop-in replacement for Carrier model PH1RPA120000AAWA. Verify the PSI ratings and lead length against your unit's data plate and existing switch before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence or contact us before you buy.