OEM Carrier 40VA Control Transformer HT01AW229 for Model HA1AJX024000ABAA

This OEM control transformer (part# HT01AW229) is the factory-specified replacement for the Carrier HA1AJX024000ABAA air handler. The transformer steps down 120V line voltage to the 24V signal required by the control board, thermostat, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — your thermostat shows no response, the system won't stage heating or cooling, and no error codes appear because the board itself has no power to report them.

• Specs: 40VA rated | 120V primary / 24V secondary | Factory OEM part number HT01AW229 | Class 2 transformer | Designed for continuous duty in forced-air air handler applications
• OEM vs Generic: OEM transformers are wound to exact VA and impedance specifications for the Carrier control board. Undersized or off-tolerance generic units can droop voltage under load, causing erratic board behavior, nuisance lockouts, or premature contactor failure — problems that look like a bad board but are actually transformer-related.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter. Verify 24V output after installation before restoring full system power. Always photograph existing wiring before disconnecting.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier HA1AJX024000ABAA air handler. Confirm your existing transformer's VA rating and primary/secondary voltage on the unit data plate before ordering to ensure a proper match. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us before placing your order.