OEM Carrier High Pressure Switch HK02ZA395 / HK02ZB044 for Model PH1PPB036000AAAA

This is the factory OEM replacement high pressure switch for the Carrier PH1PPB036000AAAA packaged heat pump unit. The pressure switch is a critical safety and sequencing component that proves the inducer motor has created sufficient negative pressure (draft) before allowing the gas valve to open. When this switch fails or sticks open, the control board cannot verify safe venting conditions — resulting in a hard lockout, no-ignition fault codes, or a system that attempts a call for heat but shuts down before the burner ever fires. Two OEM part numbers are associated with this unit: HK02ZA395 (High Pressure Switch) and HK02ZB044 (Pressure Switch) — verify against your unit's wiring diagram or control board label to confirm which switch position you are replacing.

• Specs: OEM-rated water column (W.C.) trip point | Single-port or dual-port hose barb (verify on data plate) | 24V control circuit compatible | Factory-calibrated for Carrier PH1PPB036000AAAA packaged unit
• OEM vs Generic: OEM pressure switches are factory-calibrated to exact W.C. specifications for this unit. Off-brand substitutes with incorrect trip points can cause nuisance lockouts, failed ignition sequences, or — more dangerously — allow ignition under unsafe draft conditions.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended to verify W.C. after install). Inspect rubber hose connections for cracks before reinstalling tubing. Always clear fault codes after replacement.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed and factory-matched for Carrier model PH1PPB036000AAAA packaged heat pump systems. Cross-reference OEM part numbers HK02ZA395 and HK02ZB044 against your unit's service label to confirm the correct switch position. Not sure which one you need? Contact our HVAC parts specialists — we verify fitment before you order and ship same day.