OEM Carrier Control Transformer 40VA 208/240V to 24V — HT01BD209 for Model PY3PPA060115NA

This is the factory OEM control transformer for the Carrier PY3PPA060115NA packaged unit. The transformer steps down 208/240V line voltage to the 24V DC signal that powers your thermostat, control board, gas valve, and every low-voltage component in the system. When this transformer fails, the entire control circuit goes dark — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no fault codes appear because there is no power to generate them. If you measure 0V AC on the 24V secondary terminals, this part is your fix.

• Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60 Hz | Compact form factor: 3.5" L × 2.2" W × 1.9" H | Replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: The OEM HT01BD209 is wound to exact factory VA and voltage tolerance specifications. Generic transformers may run under-rated VA loads, causing overheating, nuisance tripping of the internal thermal fuse, and premature failure — especially in packaged units with high low-voltage circuit demand.
• Install difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to confirm 0V before touching wiring), needle-nose pliers. Document or photograph all wire connections on primary and secondary terminals before disconnecting. Re-energize and confirm ~24V AC on secondary terminals before buttoning up the panel.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Direct OEM replacement for Carrier model PY3PPA060115NA packaged gas/electric units. Also compatible with select Bryant and Payne equipment sharing the same transformer spec — verify 208/240V primary and 40VA rating on your unit's data plate before ordering. Not sure if this is your part? Contact our fitment team before you order — we verify compatibility at no charge.