OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PPA048130NB

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PPA048130NB packaged unit. The control transformer steps down high-voltage line power (208/240V primary) to the 24V AC signal that drives your thermostat, control board, gas valve, contactor coil, and every other low-voltage component in the system. When this transformer fails, the entire control circuit loses power — resulting in a completely unresponsive thermostat, a system that won't call for heat or cooling, or a tripped secondary fuse with no obvious upstream cause.

• Specs: 40VA capacity | 208/240V primary | 24V secondary | 50/60Hz | OEM part # HT01BD209 | Also replaces HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic transformers often run undersized VA ratings that cause overheating under full control-circuit load, shortening the life of every component downstream.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V at primary before touching wiring), wire nuts or spade connectors. Always photograph the existing wiring before disconnecting. Confirm secondary output reads ~24V AC after installation before closing the unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct factory replacement for Carrier model PY3PPA048130NB. Also fits other Carrier, Bryant, and Payne equipment using the HT01BD207, HT01CN232, or 9076-00 transformer — verify your unit's data plate voltage and VA rating before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you order — order now and get it shipped today.