OEM Carrier 40VA Control Transformer HT01BD209 for Model PY1PNB036060NBAA

This OEM step-down transformer is the factory-specified replacement for the Carrier PY1PNB036060NBAA packaged unit. The transformer converts 120V line voltage to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this part fails, the system becomes completely unresponsive: the thermostat goes blank, the unit won't start, and no error codes are displayed because the control circuit has no power.

• Specs: Input 120V AC | Output 24V AC | 40VA rated | OEM Part Number HT01BD209 | Factory-matched winding tolerances for stable control voltage
• OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact factory VA and voltage specifications. Generic transformers may deliver inconsistent output voltage, causing erratic thermostat behavior, contactor chatter, or premature control board failure.
• Install Difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Always photograph existing wiring connections before removing the old transformer.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY1PNB036060NBAA packaged unit. Confirm input/output voltage and VA rating on your unit's data plate before ordering. Not sure it fits? Contact our HVAC parts specialists — we verify fitment before you buy.