OEM Carrier High Pressure Switch HK02ZA442 for Model FIOP100B311GA

This OEM high pressure switch (part number HK02ZA442) is the factory-specified replacement for the Carrier FIOP100B311GA packaged or fan coil unit. The pressure switch monitors the system's refrigerant or airside pressure to verify safe operating conditions before and during the heating cycle. When this switch fails or sticks open, the control board cannot confirm proper pressure, resulting in a system lockout, a no-heat condition, or an inducer-proving fault before ignition is ever attempted.

• Specs: High pressure switch | OEM part number HK02ZA442 | Factory-calibrated W.C. (water column) setpoint | Single-port sensing | 24V control circuit compatible
• OEM vs Generic: This is a genuine Carrier OEM component manufactured to exact factory pressure setpoint tolerances. Aftermarket pressure switches frequently carry imprecise trip points that can cause nuisance lockouts or, worse, fail to protect the system under fault conditions — compromising both comfort and equipment longevity.
• Install difficulty: 2/5 — Shut off power at the disconnect and confirm zero voltage before beginning. Tools needed: 1/4" nut driver, flat-head screwdriver, needle-nose pliers, and a multimeter for continuity verification. Always label or photograph tubing and wiring connections prior to removal. Inspect the rubber sensing hose for cracks or blockages before installing the new switch.
• Warranty: Backed by a 1-year OEM factory warranty. Orders placed before the daily cutoff ship same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FIOP100B311GA. Verify the OEM part number HK02ZA442 against your unit's data plate or wiring diagram before ordering to confirm correct pressure setpoint for your application. Our HVAC parts specialists are available to verify fitment prior to purchase — no guesswork required. In stock and ready to ship today.