OEM Carrier Control Transformer 40VA 208/230V–24V for Model PY3PPA048115AA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PPA048115AA packaged unit. The transformer steps down 208/230V line voltage to 24V AC, powering the low-voltage control circuit that drives your thermostat, contactor coils, and integrated control board. When this transformer fails, the entire control circuit goes dark — you'll see a blank thermostat display, a completely unresponsive system, or tripped low-voltage fuses that immediately blow again upon reset.

• Specs: 208/230V Primary | 24V Secondary | 40VA capacity | 50/60 Hz | Replaces HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: OEM transformers are wound and insulated to exact Carrier factory tolerances. Generic units may run with inconsistent secondary output voltage — even a 1–2V variance can cause nuisance lockouts or control board damage over time.
• Install difficulty: 2/5 — Shut off all power at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminals. Always verify 24V output at secondary leads before powering the full control circuit. Photograph or label all wiring before disconnecting.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY3PPA048115AA packaged unit. Cross-references confirmed with OEM part numbers HT01BD207, HT01CN232, and 9076-00. Always verify the voltage and VA rating on your unit's data plate before ordering. Our team is available to confirm fitment — just ask before you buy.