OEM Carrier Transformer 40VA 120V–24V for Model PH13NR02400GAJAA

This is the factory OEM replacement transformer (part number HT01AW229) for the Carrier PH13NR02400GAJAA heat pump system. The control circuit transformer steps line voltage (120V) down to the 24V signal voltage that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dark — the thermostat shows no response, the system won't call for heating or cooling, and no relays or contactors will energize. Replacing it with the correct OEM unit restores safe, factory-spec operation immediately.

• Specs: 120V primary → 24V secondary | 40 VA rating | OEM part number HT01AW229 | Factory-matched for Carrier PH13NR02400GAJAA
• OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and insulation class. Generic transformers may be undersized in VA, causing voltage sag that triggers nuisance lockouts and prematurely burns contactor coils.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to confirm 24V output after install), wire stripper, and wire nuts or spade connectors. Always photograph existing wiring before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed and tested specifically for the Carrier PH13NR02400GAJAA heat pump. Verify your unit's control voltage and VA requirement on the data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — contact us today and get your system back online fast.