OEM Carrier Transformer 40VA 24V Control Circuit for Model HC1BNX048000AAAA

This OEM replacement transformer (part number HT01AW229) is the factory-specified control circuit transformer for the Carrier HC1BNX048000AAAA packaged unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, contactor coil, and all low-voltage control components. When the transformer fails, the entire system goes dark — the thermostat loses power, the contactor won't energize, and neither heating nor cooling will operate. A failed transformer is often misdiagnosed as a thermostat or control board issue, so always verify 24V output at the secondary terminals before replacing other components.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Ring-mount or bracket mount | OEM part number HT01AW229 — exact factory match for HC1BNX048000AAAA
• OEM vs Generic: OEM transformers are wound to precise VA ratings and insulation standards. Undersized or off-spec generic units can overheat under full control-circuit load, tripping built-in fuses or failing prematurely — a costly callback risk.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before touching any wiring. Tools needed: multimeter, flathead and Phillips screwdrivers, wire nuts or spade terminals. Label all wires before disconnecting the old unit and confirm primary/secondary orientation before energizing.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier HC1BNX048000AAAA packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltage from your unit's data plate before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get your system back online fast.