OEM Carrier Pressure Switch HK02ZB044 — 7 PSI Open / 22 PSI Close for Model PH1REA036000AAWB

This OEM pressure switch (part number HK02ZB044) is the factory-specified replacement for the Carrier PH1REA036000AAWB packaged heat pump unit. The pressure switch proves that the inducer motor has established adequate draft before allowing ignition to proceed. When this switch fails or becomes stuck open, the control board interprets a draft fault and locks out the unit — resulting in a no-heat condition, a flashing fault code, or a system that attempts startup and immediately shuts down without firing.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" wire leads | 24V coil circuit | Country of Origin: Mexico | OEM part number HK02ZB044
• OEM vs Generic: This is a genuine Carrier OEM pressure switch engineered to exact factory tolerances. Generic switches can carry wider pressure tolerances, leading to nuisance lockouts or — worse — unsafe operation. OEM ensures the correct trip point every time.
• Install difficulty: 2/5 — Turn off power at the disconnect before servicing. Tools needed: 1/4" nut driver, flat-head screwdriver, manometer (recommended to verify W.C. at port). Photograph all wiring and tubing routing before disconnecting. Swap hose and connector, restore power, and verify draft-proven status on the board.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Direct OEM replacement for Carrier model PH1REA036000AAWB packaged heat pump unit. Verify pressure ratings (7 PSI open / 22 PSI close) and lead length (50") against your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — reach out via chat or phone before placing your order.