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This is the OEM factory-specified control transformer for the Carrier PH10JA036000ADAA packaged heat pump unit. The transformer steps down the 115/208/230V line-voltage supply to the 24V AC signal that powers your thermostat circuit, contactor coil, and all low-voltage controls. When it fails, the entire control circuit goes dead — no thermostat response, no compressor engagement, and no fan operation. A blown transformer is often confirmed by a burning smell, a tripped internal fuse, or simply 0V on the secondary terminals with line voltage present at the primary.
Compatibility: Engineered as a direct OEM drop-in replacement for the Carrier PH10JA036000ADAA packaged heat pump. Cross-references include HT01AW229A. Verify your unit's supply voltage before selecting the correct primary tap. Not sure it fits? Our HVAC parts specialists confirm fitment before you order — ships same day.