OEM Carrier Low Pressure Switch HK02ZB028 for Model PH13PR04200GAJAA

This is the factory OEM low pressure switch for the Carrier PH13PR04200GAJAA heat pump. The low pressure switch continuously monitors refrigerant-side pressure in the system and trips open at 27 PSI to protect the compressor when suction pressure drops dangerously low — a condition caused by refrigerant loss, a restricted metering device, or a blocked filter. Without a functioning switch, a low-charge system will run unprotected, leading to compressor burnout. When this switch fails or trips, your system will typically short-cycle, throw a lockout fault code, or refuse to run the compressor entirely.

• Specs: Closes at 60 PSI | Opens at 27 PSI | 48-inch lead length | 240VAC rated | 6(6)A | OEM Part# HK02ZB028 (cross-ref: PS80-02-F0073, 067-027)
• OEM vs Generic: This is a genuine Carrier factory-authorized part built to exact trip-point tolerances. Aftermarket switches often carry ±5 PSI variance on setpoints, risking nuisance trips or — worse — compressor damage from under-protection. OEM is the only safe choice on refrigerant-circuit safety controls.
• Install difficulty: 3/5 — Refrigerant circuit work should be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, 1/4-inch flare fittings, multimeter for continuity verification. Always recover refrigerant before removing the switch and verify pressure setpoints after reinstallation.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH13PR04200GAJAA heat pump. Verify your unit's existing switch PSI setpoints and lead length against your data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.