OEM Carrier High Pressure Switch 312926-252 for Model PH4ANG036000BCAA

This OEM high pressure switch (part number 312926-252) is the factory-specified safety control for the Carrier PH4ANG036000BCAA heat pump. The high pressure switch continuously monitors refrigerant discharge pressure and opens the control circuit when pressure exceeds safe operating limits — protecting the compressor from catastrophic overload. When this switch fails or trips on nuisance faults, you'll typically see the system locking out on a high-pressure fault code, the compressor shutting down unexpectedly, or the unit failing to cool or heat despite the fan running normally.

• Specs: 670 PSI cutout / 470 PSI reset | Factory-rated for R-410A refrigerant systems | SPST normally-closed safety switch | Rated to EN12263 / EN60730-2-6 safety standards
• OEM vs Generic: This is a genuine Carrier OEM part — factory-calibrated to exact cutout and reset pressures. Aftermarket switches often carry wider PSI tolerances, risking either nuisance trips or, worse, under-protection of the compressor.
• Install difficulty: 3/5 — Refrigerant system access is required. Tools needed: manifold gauge set, refrigerant-rated wrench set, and a multimeter to confirm continuity before and after replacement. Must be installed by an EPA 608-certified technician.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model PH4ANG036000BCAA (3-ton heat pump). Always verify the cutout/reset PSI rating and refrigerant type on your unit's data plate before ordering. Our team is available to confirm fitment — contact us before you order if you have any questions.