OEM Carrier Transformer 40VA 120V to 24V for Model HA1AJX060000AAAA

This OEM replacement transformer (part number HT01AW229) is the factory-specified control circuit transformer for the Carrier HA1AJX060000AAAA system. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control components. When the transformer fails, the entire control circuit loses power — the thermostat goes blank, the system stops responding entirely, and no heating or cooling function is possible. A failed transformer is often caused by a downstream wiring short, so always inspect low-voltage wiring before installing a replacement.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01AW229 | Factory-matched output voltage and VA capacity for reliable control circuit operation
• OEM vs Generic: This OEM unit meets Carrier's exact VA rating and insulation class specifications. Undersized or off-brand transformers can overheat quickly, especially if any low-voltage wiring resistance is marginal, leading to repeat failures 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. Use your multimeter to confirm 120V input and check for low-voltage shorts before energizing the new transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier HA1AJX060000AAAA. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If you have any fitment questions, our HVAC parts specialists confirm compatibility before you buy — no guesswork required.