OEM Carrier 40VA Control Transformer 120V–24V for Model PH10JA030000AEAA

This OEM Carrier transformer (part #HT01AW229) is the factory-specified replacement for the Carrier PH10JA030000AEAA packaged heat pump unit. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the entire control circuit goes dead: your thermostat loses power, the system will not respond to any call for heating or cooling, and no fault codes will display.

• Specs: 120V primary | 24V secondary | 40VA rated | OEM part #HT01AW229 | Factory-matched for Carrier PH10JA030000AEAA
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, ensuring stable 24V output under full control-circuit load. Generic units may under-deliver under load, causing nuisance lockouts and premature contactor coil failure.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Always label wires before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model PH10JA030000AEAA packaged heat pump units. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. Our technical team is available to confirm fitment — contact us before you order if you have any questions.