OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PNA048090AA

This is the genuine OEM Carrier control transformer (part #HT01BD209) factory-specified for the Carrier PY3PNA048090AA packaged unit. The transformer steps line voltage (208/240V) down to the 24V DC control circuit that powers your thermostat, contactor coil, gas valve, and all low-voltage components. When this transformer fails, nothing in the system responds — the thermostat goes blank, the unit won't energize, and you may detect a burning smell or a blown 3A fuse on the control board. Replacing this transformer is one of the fastest paths back to a fully operational system.

• Specs: 40VA capacity | 208/240V primary input | 24V secondary output | 50/60 Hz | Approx. 1.3 lbs | Direct OEM replacement
• OEM vs Generic: OEM transformers are wound and potted to exact factory tolerances, ensuring a stable 24V output under full load. Generic substitutes can sag under load, causing intermittent lockouts and premature control board failure.
• Install Difficulty: 2/5 — Shut off all power at the breaker and verify zero voltage before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire labels. Photograph all wiring connections before disconnecting. Typical job time: 20–30 minutes.
• Warranty & Shipping: 1-year OEM factory warranty. In stock — ships same business day from our warehouse. Free standard shipping available.

Compatibility: Factory-matched for Carrier model PY3PNA048090AA. Also replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00. Confirm your unit's data plate voltage matches 208/240V primary before ordering. Our fitment team is available to verify compatibility prior to purchase.