OEM Carrier Control Transformer 60VA 115/208/230V–24V for Model PH12NA060000AAAA

This is the factory OEM control transformer for the Carrier PH12NA060000AAAA heat pump system, part number HT01AW229. The control transformer steps down high-voltage supply power (115, 208, or 230 VAC) to the 24 VAC signal voltage required by the thermostat, contactor coils, and control board. When this transformer fails, the entire low-voltage control circuit loses power — resulting in a completely unresponsive system: no heating, no cooling, no thermostat communication, and no error codes displayed. A failed transformer is often diagnosed by measuring 0V AC at the secondary terminals (R and C on the control board) with line voltage confirmed at the primary.

• Specs: 60 VA power rating | Primary voltage: 115 / 208 / 230 VAC | Secondary voltage: 24 VAC | 50/60 Hz | Foot-mounted configuration | OEM part number HT01AW229 (also supersedes HT01AW229A)
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part. OEM transformers are wound to exact VA and voltage tolerances for your unit. Generic transformers are often under-rated at 40 VA and can overheat under full control-circuit load, causing repeated failures and potential board damage.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before proceeding. Tools needed: multimeter, screwdriver set, wire stripper, and needle-nose pliers. Always verify 0V at primary terminals before touching wiring. Label all wire connections before removal and confirm primary tap selection (115V vs 208/230V) matches your supply voltage.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for the Carrier PH12NA060000AAAA heat pump. Also cross-references to Bryant and Payne units using the same transformer specification. Verify your existing transformer's VA rating and primary voltage tap on the data plate before ordering. Our parts specialists are available to confirm fitment prior to purchase.