OEM Carrier High Pressure Switch HK02ZA442 for Model FIOP100E301GA

This is the factory OEM high pressure switch (part number HK02ZA442) designed specifically for the Carrier FIOP100E301GA. The pressure switch is a critical safety component in your HVAC system — it monitors flue gas pressure to confirm the inducer motor is operating correctly before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board receives no proof-of-pressure signal, resulting in a system lockout, no-heat condition, or repeated failed ignition attempts. Common symptoms include the inducer running but the burners never lighting, error codes indicating a pressure switch fault, or the system cycling on and off without producing heat.

• Specs: High pressure switch | OEM part number HK02ZA442 | Factory-calibrated W.C. (water column) rating | Designed for Carrier FIOP100E301GA packaged or commercial unit — verify rating on data plate before ordering
• OEM vs Generic: This is a genuine OEM Carrier pressure switch manufactured to exact factory W.C. specifications. Aftermarket switches frequently carry wider calibration tolerances that can cause nuisance trips, premature lockouts, or — more dangerously — failure to detect true venting faults. OEM is always the recommended choice for pressure switches.
• Install difficulty: 3/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, short piece of tubing for hose reconnection, and a manometer if verifying switch trip point. Always inspect the rubber pressure port hose for cracks or blockages before installing the new switch, as a collapsed hose is a frequent root cause of switch failure.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Engineered as the direct OEM replacement for the Carrier FIOP100E301GA. Always cross-reference the W.C. rating stamped on your existing switch and confirm the model number on the unit data plate prior to ordering. If you need fitment assistance, our HVAC parts specialists are available to verify compatibility before you buy. In stock — ships today.