OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PNA048130NB

This genuine OEM Carrier control transformer (part# HT01BD209) is the factory-specified replacement for the Carrier PY3PNA048130NB packaged unit. The transformer steps down 208/240V line voltage to the 24V low-voltage signal that powers every critical control circuit in your system — including the thermostat, contactor coil, control board, and safety switches. When it fails, nothing works: the thermostat goes dark, the system refuses to respond to any call, and the blower and compressor will not energize. A failed transformer is often misdiagnosed as a thermostat or control board fault, making correct identification and prompt replacement essential.

• Specs: 40VA | Primary: 208/240V | Secondary: 24V | 50/60Hz | Class 2 control transformer | Factory-matched for Carrier PY3PNA048130NB
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for your unit. Generic units can run hot under full control load, tripping thermal protection and causing intermittent lockouts — always choose OEM for transformers.
• Install difficulty: 2/5 — Shut off power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always verify 24VAC output after installation before buttoning up the panel.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3PNA048130NB. Also replaces legacy Carrier part numbers HT01BD207, HT01CN232, and 9076-00. Verify your existing transformer's primary voltage and VA rating on the data plate before ordering. Our fitment team is available to confirm compatibility prior to purchase.