OEM Carrier Control Circuit Transformer 40VA for Model PY3PNA030060NA

This is the genuine OEM replacement transformer (part number HT01BD209) for the Carrier PY3PNA030060NA fan coil/air handler system. The transformer steps down line voltage (120V) to the 24V AC signal that powers your entire control circuit — including the thermostat, contactors, and control board. When this part fails, nothing works: the system will be completely unresponsive at the thermostat with no heating, cooling, or fan operation. A failed transformer is often confirmed by measuring 0V on the secondary (24V) side with a multimeter while line voltage is present at the primary.

• Specs: 120V primary input | 24V AC secondary output | 40VA rating | Factory OEM-matched terminals and mounting footprint
• OEM vs Generic: The OEM HT01BD209 is wound to Carrier's exact VA rating and insulation class. Under-rated generic transformers run hot, trip thermal cutoffs prematurely, and fail within one season — especially under full relay load.
• Install difficulty: 2/5 — Shut off all power at the breaker before replacing. Tools needed: flat-head and Phillips screwdriver, multimeter, wire nuts or spade connectors. Label all wires before disconnecting. Verify 24V output after installation before closing the panel.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct factory replacement for Carrier PY3PNA030060NA. Always verify primary voltage and VA rating on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — contact us with your full model and serial number.