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This is the OEM factory-specified contactor for the Carrier PH1PPA036000AABA packaged heat pump unit. The contactor is the high-voltage relay that receives a 24V signal from the thermostat and closes the circuit to send 240V power to the compressor and condenser fan motor. When the contactor fails — due to burned or pitted contact points, a stuck plunger, or a failed coil — the outdoor unit simply won't start, even though the thermostat is calling for cooling or heating. Replacing it with the correct OEM part (HN52KC025) restores factory-reliable switching performance and protects downstream components from voltage irregularities.
Compatibility: Designed as a direct OEM replacement for Carrier model PH1PPA036000AABA packaged heat pump systems. Always verify your existing contactor's pole count, coil voltage, and amperage rating against your unit's data plate before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork.