OEM Carrier 40VA Control Transformer HT01AW229 for Model HA1BJX024000AAAA

This OEM Carrier control transformer (part number HT01AW229) is the factory-specified replacement for the HA1BJX024000AAAA air handler unit. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the result is typically a completely unresponsive system: the thermostat goes dark, the unit refuses to start, and no error codes are generated because the control circuit has no power to operate.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01AW229 | Factory-matched construction for reliable low-voltage output
• OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and insulation specifications. Generic transformers often use undersized windings that overheat under peak demand loads, leading to premature failure and potential control board damage.
• Install difficulty: 2/5 — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wiring connections before removal and confirm 24V output with a multimeter before reassembling the unit.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier HA1BJX024000AAAA air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering. If you're unsure of fitment, our HVAC parts team is available to confirm compatibility before you buy — so you get the right part the first time.