OEM Carrier Control Transformer 40VA 120V/24V for Model CH13NA03000GAAAA

This OEM control transformer (part# HT01AW229) is the factory-specified replacement for the Carrier CH13NA03000GAAAA condensing 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 any connected control boards. When it fails, the entire control circuit goes dead: your thermostat goes blank, the system stops responding to calls for cooling, and nothing turns on despite power being present at the unit.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Direct OEM replacement for part# HT01AW229
• OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage tolerances required by Carrier engineering. Generic transformers rated at 40VA often deliver inconsistent secondary voltage under load, causing nuisance lockouts, contactor chatter, and premature control board failure.
• Install difficulty: 2/5 — Disconnect power at the disconnect box and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter. Photograph all wiring connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier CH13NA03000GAAAA condensing unit. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating on the unit data plate or the old transformer's label before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork, no returns.