OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PPA036090NA

This OEM control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PPA036090NA packaged unit. The transformer steps down the 208/240V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dead — no call for heat or cool will register, and the system will not respond to the thermostat at all. A shorted transformer may also blow the low-voltage fuse on the control board, so always inspect and replace that fuse during installation.

• Specs: 40VA capacity | 208/240V primary | 24V secondary | 50/60Hz | Replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: OEM transformers are wound and rated to exact factory tolerances, ensuring stable 24V output under full load. Generic units often deliver inconsistent voltage under peak demand, causing erratic board behavior and nuisance lockouts.
• Install difficulty: 2/5 — Shut off power at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm primary voltage at the unit's data plate (208V or 240V) before wiring. Always check and replace the low-voltage fuse on the control board if the old transformer failed due to a short.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3PPA036090NA packaged unit. Verify your unit's supply voltage (208V or 240V) on the data plate before ordering. This part also cross-references to Bryant and Payne equipment sharing the same transformer specification. Questions about fitment? Our team verifies compatibility before you order — ships same day.