OEM Carrier Transformer 40VA 120V–24V for Model PH10PA04800GACAA

This is the factory OEM replacement transformer (part number HT01AW229) for the Carrier PH10PA04800GACAA packaged heat pump unit. The transformer steps down 120V line voltage to the 24V signal used by the thermostat, control board, contactor coil, and every low-voltage component in the system. When it fails, the entire control circuit goes dark — the thermostat shows no response, the system won't energize, and no fault codes appear because the board itself has no power.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01AW229 | Factory-matched output tolerance
• OEM vs Generic: OEM transformers are wound and tested to exact Carrier specifications, ensuring proper VA output under full control-circuit load. Generic units often underperform on VA capacity, causing nuisance lockouts, thermostat brownouts, and premature contactor coil failure.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before handling. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. A simple, straightforward swap for any experienced tech or confident DIYer.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Engineered specifically for the Carrier PH10PA04800GACAA packaged heat pump. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or the old transformer's label before ordering. Our parts specialists are available to confirm fitment — reach out before you buy if you're unsure.