OEM Carrier Low Pressure Switch HK02ZB044 for Model PH1RPA036000AAWA

This OEM low pressure switch (part number HK02ZB044) is the factory-specified replacement for the Carrier PH1RPA036000AAWA packaged unit. The pressure switch monitors the operation of the inducer motor by sensing negative air pressure (draft) inside the flue. When the inducer is running correctly, the switch closes to allow the ignition sequence to proceed. A failed or stuck-open pressure switch prevents the ignition cycle from ever starting, leading to a no-heat lockout — one of the most common furnace/packaged unit service calls.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" wire leads | 24V control circuit | Country of origin: Mexico
• OEM vs Generic: This is a genuine Carrier OEM part, meeting exact factory design tolerances for pressure setpoints and diaphragm durability. Aftermarket switches frequently drift from rated setpoints over time, causing nuisance lockouts or — worse — unsafe operation.
• Install difficulty: 2/5 — Straightforward swap with no refrigerant handling required. Tools needed: 1/4" nut driver, needle-nose pliers, and a multimeter to verify continuity before reinstallation. Always confirm 24V at the pressure switch terminals before condemning the part — a blocked condensate drain or failed inducer motor can mimic a bad pressure switch.
• Warranty: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Direct OEM replacement for the Carrier PH1RPA036000AAWA packaged unit. Verify the pressure setpoints on your existing switch's label (7# open / 22# close) and lead length before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — no guesswork, no costly return shipping.