OEM Carrier Low Pressure Switch 312926-258 for Model PH16NC02400GBAAA

This OEM low pressure switch (part# 312926-258) is the factory-specified replacement for the Carrier PH16NC02400GBAAA packaged heat pump unit. The pressure switch is a critical safety device that monitors the negative pressure (inches of water column) generated by the inducer/draft motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails — or when a blocked flue, failed inducer motor, or cracked pressure hose causes an out-of-range reading — the control board will lock out the system and prevent heating or cooling operation entirely.

• Specs: Low pressure switch | Factory-rated W.C. (water column) set point | Direct OEM replacement for part# 312926-258 | Spade terminal connectors for drop-in fitment
• OEM vs Generic: This is a genuine OEM Carrier part, manufactured to exact factory pressure set-point tolerances. Aftermarket switches frequently carry ±5–10% W.C. tolerances, which can cause nuisance lockouts or — more dangerously — allow operation under unsafe venting conditions.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended to verify hose integrity). Always inspect the rubber pressure hose for cracks or blockages before replacing the switch, as a damaged hose is a frequent root cause of switch failure.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier PH16NC02400GBAAA packaged heat pump unit. Verify the W.C. rating stamped on your existing switch and match it to your unit's data plate before ordering. If you need help confirming fitment, our HVAC parts specialists are available to verify compatibility before you buy — call or chat today. Order before 3 PM local time for same-day shipping.