OEM Carrier Transformer 40VA 120V to 24V for Model HA1BJX036000ACAA

This OEM replacement transformer (part# HT01AW229) is the factory-specified control circuit transformer for the Carrier HA1BJX036000ACAA split-system unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, control board, contactor coil, and all low-voltage control circuits. When the transformer fails — typically from a short in the control wiring or an overloaded secondary circuit — the entire system goes dead: no thermostat display, no contactor pull-in, and no response from any control component. Replacing the transformer with the correct OEM unit restores the full 24V control circuit immediately.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01AW229 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: This OEM transformer is wound and rated to Carrier's exact VA and voltage specifications. Generic transformers often under-rate their VA capacity, causing premature thermal cutout and repeat failures — especially when multiple 24V accessories are connected.
• Install Difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph existing wire connections before removal. Secondary wiring typically connects with push-in or screw terminals. Verify 24V output with a multimeter before reassembling the panel.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier HA1BJX036000ACAA split-system unit. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. If you're unsure of fitment, our HVAC parts specialists confirm compatibility before you buy — no guesswork required. Order today and receive same-day shipping on all in-stock parts.