OEM Carrier 40VA Control Transformer HT01AW229 for Model HA1CJX024000AAAA

This is the OEM factory-specified control transformer (part number HT01AW229) for the Carrier HA1CJX024000AAAA air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuit components. When the transformer fails, absolutely nothing will respond — the thermostat goes dark, the system won't heat or cool, and no error codes will appear because the control circuit has no power to generate them. If you've already verified your thermostat and checked your breakers, a failed transformer is the next most likely culprit.

• Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01AW229 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: This OEM transformer is wound and tested to exact Carrier factory specifications. Generic transformers may carry inconsistent VA ratings that cause nuisance tripping of the internal fuse or under-voltage faults at the control board, shortening board life.
• Install difficulty: 2/5 — Shut off power at the breaker and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all existing wiring before disconnecting. The transformer typically mounts inside the air handler cabinet with two to four wire connections.
• Warranty: 1-year OEM factory warranty. In-stock units ship the same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier HA1CJX024000AAAA air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering to confirm fitment. Our parts specialists are available to verify compatibility before you buy — no guesswork required. Order now and receive same-day shipping on all in-stock parts.