OEM Carrier Control Transformer 40VA 208/230V to 24V for Model PY3PPA030060NB

This OEM control transformer (part # HT01BD209) is the factory-specified replacement for the Carrier PY3PPA030060NB HVAC system. The transformer steps down line voltage from 208/230V to the 24V low-voltage signal that powers your thermostat, control board, and all safety circuit components. When this part fails, the entire control circuit goes dark — symptoms include a completely unresponsive thermostat, a system that won't respond to any call for heating or cooling, or tripped 24V fuses caused by a shorted transformer secondary winding.

• Specs: 208/230V Primary | 24V Secondary | 40VA rated | 50/60Hz | Class 2 control transformer | Replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA and impedance specs. Undersized or off-tolerance generic units can overheat, blow fuses repeatedly, or fail to supply adequate current to the control board under load — leading to misdiagnosis and repeat service calls.
• Install difficulty: 2/5 — Shut off all power to the unit before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label and photograph all low-voltage wiring before disconnecting. After installation, verify 24–28V AC output at the secondary terminals under load before re-energizing the full system.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before the cutoff.

Compatibility: Engineered as the direct OEM replacement for Carrier model PY3PPA030060NB. Also replaces legacy Carrier part numbers HT01BD207, HT01CN232, and 9076-00. Confirm 208/230V primary voltage on your unit's data plate before ordering. Our fitment team is available to verify compatibility before you buy.