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This is the OEM factory-authorized replacement control transformer for the Carrier PH12NA06000GABAA packaged heat pump unit. Part number HT01AW229, this foot-mounted transformer steps down the 115/208/230V line voltage to the 24V AC signal required to power the control board, thermostat circuit, and all low-voltage safety controls. When this transformer fails, absolutely nothing in the control circuit operates — no contactor pull-in, no thermostat response, no error codes. A failed transformer is often misdiagnosed as a bad control board; always verify 24V output at the secondary terminals before condemning any other component.
Compatibility: Verified OEM replacement for Carrier model PH12NA06000GABAA packaged heat pump. Cross-references: HT01AW229A. Always confirm primary voltage matches your unit's supply voltage (115V, 208V, or 230V) on the data plate before installation. Order today — our HVAC specialists verify fitment before your part ships.