OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PNA036090NA

This OEM control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA036090NA packaged unit. The transformer steps down the 208/240V line voltage to the 24V signal used by your thermostat, contactor coil, and control board. When this part fails, the entire low-voltage control circuit goes dark — the system will not respond to thermostat calls for heat or cool, and no error codes may even appear since the board itself loses power.

• Specs: Input 208/240V | Output 24V | 40VA power rating | 50/60Hz | Factory OEM part number HT01BD209 | Carrier-matched construction and insulation class
• OEM vs Generic: OEM transformers are wound and insulated to exact Carrier factory tolerances, ensuring stable 24V output under full-load conditions. Generic units may produce voltage sag under load, causing erratic contactor chatter, nuisance lockouts, or premature control board failure.
• Install difficulty: 2/5 — Always disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output post-install), wire nuts or spade connectors. Photograph or label all low-voltage wiring before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA036090NA packaged unit. Verify input voltage on your unit's data plate (208V or 240V) before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — order with confidence and get back to comfort fast.