OEM Carrier Control Transformer 40VA 208/240V→24V for Model PF1MNA071000ADAA

This OEM Carrier transformer (part #HT01CN236) is the factory-specified replacement for the Carrier PF1MNA071000ADAA air handler. The transformer steps down high-voltage line power (208/240V) to the 24V AC signal that drives your thermostat, control board, and every low-voltage component in the system. When this part fails, the entire control circuit goes dark — your thermostat goes unresponsive, your system won't call for heating or cooling, and no error codes appear because even the board has lost power.

• Specs: 40VA capacity | 208/240V primary input | 24V secondary output | 50/60 Hz | Factory-matched OEM design for direct drop-in fit
• OEM vs Generic: The OEM HT01CN236 is wound and insulated to Carrier's exact specifications, ensuring proper VA capacity and voltage regulation under full system load. Generic transformers may be undersized in VA rating, causing premature burnout when multiple components demand simultaneous draw.
• Install difficulty: 2/5 — Shut off the disconnect and verify zero voltage at the transformer terminals before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire strippers. Always photograph existing wiring connections before removal. A blown fuse on the secondary side is a sign of a downstream short — find and fix it before installing the new transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Directly fits the Carrier PF1MNA071000ADAA air handler. This part is also cross-referenced across select Bryant and Payne platforms sharing the same control circuit architecture. Verify the 40VA rating and 208/240V primary voltage on your unit's data plate before ordering. Our fitment team is available to confirm compatibility — reach out before you buy if you have any questions.