OEM Carrier 40VA Control Transformer HT01BD209 for Model PY3PNA060115NA

This OEM control transformer is the factory-specified replacement for the Carrier PY3PNA060115NA packaged unit. The transformer steps down 208/230V line voltage to the 24V signal that powers your thermostat, control board, and every low-voltage component in the system. When this part fails, the entire control circuit loses power — the result is a completely unresponsive system: no heat, no cooling, no fan, and no error codes on the board. If your system is completely dead and your 24V fuse is intact, this transformer is the first component to test.

• Specs: 40VA rating | 208/230V primary input | 24V secondary output | 50/60 Hz | Compact footprint: 3.5" L × 2.2" W × 1.9" H | Replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances. Undersized aftermarket units can overheat the secondary winding, trip thermal protection, or allow voltage sag that causes nuisance lockouts on sensitive control boards.
• Install difficulty: 2/5 — Shut off power at the breaker and confirm zero voltage before touching any terminals. Tools needed: flathead and Phillips screwdrivers, multimeter (to confirm 24V output after installation), wire nuts or push-in connectors. Photograph all wiring before disconnecting.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered for the Carrier PY3PNA060115NA packaged unit. Verify your existing transformer's VA rating and primary voltage on the unit data plate before ordering. Cross-reference OEM part numbers HT01BD207, HT01CN232, and 9076-00 are all superseded by HT01BD209. Questions about fitment? Our HVAC parts team confirms compatibility before you order.