OEM Carrier High & Low Pressure Switch for Model CH13NA02500GABAA

These OEM pressure switches — 312926-252 (High Pressure Switch) and 312926-258 (Low Pressure Switch) — are the factory-specified replacements for the Carrier CH13NA02500GABAA condensing unit. Pressure switches prove that the inducer motor has established adequate draft before allowing the ignition sequence to proceed. A failed pressure switch causes the system to lock out before ignition, often displaying a fault code and leaving you with no heat. Common symptoms include the inducer running continuously with no ignition attempt, or repeated short-cycle lockouts.

• Specs: 312926-252 — High Pressure Switch | 312926-258 — Low Pressure Switch | Factory-calibrated W.C. (water column) set points | Direct OEM replacement — no field adjustment required
• OEM vs Generic: OEM pressure switches are factory-calibrated to the exact W.C. rating required for safe draft proving on the CH13NA02500GABAA. Aftermarket switches frequently carry loose tolerances that can cause nuisance lockouts or — more dangerously — allow operation under unsafe draft conditions.
• Install difficulty: 3/5 — Turn off power at the disconnect and gas supply before beginning. Tools needed: 1/4" nut driver, flat-head screwdriver, needle-nose pliers, and a manometer if verifying W.C. readings. Always inspect the inducer hose for cracks or blockages before replacing the switch, as a collapsed hose is a common root cause of pressure switch failure.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: These switches are direct OEM replacements for Carrier CH13NA02500GABAA condensing units. Confirm which switch requires replacement — high (312926-252) or low (312926-258) — by referencing your control board fault code or testing continuity across each switch during an inducer cycle. If you need help confirming fitment, our HVAC parts specialists are standing by before you order.