OEM Carrier 40VA 24V Control Transformer HT01BD209 for Model PY3GPAA36090NA

This OEM control transformer is the factory-specified replacement for the Carrier PY3GPAA36090NA packaged gas/electric unit. The transformer steps 120V line voltage down to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this part fails, nothing in your system responds: the thermostat goes blank, the unit won't energize, and you may measure 0V at the secondary terminals. Replacing it with the correct OEM part restores factory-matched performance and protects every downstream control component from voltage irregularities.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM Part Number: HT01BD209 | Factory-matched output tolerance for stable low-voltage control
• OEM vs Generic: This OEM transformer is wound and rated to exact Carrier factory specifications. Generic or off-brand transformers often run outside ±5% voltage tolerance, which can cause nuisance lockouts, erratic thermostat behavior, or premature control board failure.
• Install difficulty: 2/5 — Shut off all power at the breaker and disconnect switch before beginning. Tools needed: flathead and Phillips screwdriver, multimeter (to verify 0V before touching wires), wire nuts or spade connectors. Photograph all wiring connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships the same business day from our warehouse.

Compatibility: Engineered for Carrier model PY3GPAA36090NA packaged units. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. If you are unsure of fitment, our parts specialists are available to confirm compatibility before you purchase — same-day shipping on all in-stock orders.