OEM Carrier High & Low Pressure Switch for Model CH13NA04300GABBA

These OEM pressure switches — 312926-252 (High Pressure Switch) and 312926-258 (Low Pressure Switch) — are the factory-specified replacements for the Carrier CH13NA04300GABBA condensing unit. Pressure switches monitor the inducer motor's draft pressure via a hose connected to the inducer housing. When the switch fails to close (or fails open), the control board cannot confirm proper venting and the system locks out before ignition — resulting in a no-heat condition with a pressure switch fault code displayed.

• Specs: 312926-252 — High Pressure Switch | 312926-258 — Low Pressure Switch | Factory water column (W.C.) rating matched to CH13NA04300GABBA inducer assembly | SPST normally-open contacts | OEM-matched hose barb diameter
• OEM vs Generic: OEM pressure switches are calibrated to the exact W.C. trip point required by this model. Off-spec generic switches can trip too early or too late, causing nuisance lockouts or — worse — allowing operation under unsafe draft conditions.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter (continuity test). Inspect the rubber hose and hose port for cracks or blockages before condemning the switch — a plugged port is a common misdiagnosis. Replace the hose if stiff or cracked.
• Warranty: 1-year OEM factory warranty on both switches. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed specifically for the Carrier CH13NA04300GABBA condensing unit. Select the correct switch — high (312926-252) or low (312926-258) — by matching the part number on the switch body or referencing the wiring diagram inside the unit's access panel. Confirm the W.C. rating on your data plate before ordering. Our fitment team is available to verify compatibility before you purchase — same-day shipping available on in-stock OEM parts.