OEM Carrier Control Transformer 40VA 208/230V–24V for Model PF4MNA019T00AAAA

This is the factory-specified OEM control transformer (part# HT01CN241) for the Carrier PF4MNA019T00AAAA air handler. The transformer steps down line voltage (208/230V primary) to the 24V AC signal that powers your thermostat, control board, and all low-voltage safety circuits. When this transformer fails, nothing works — the thermostat goes dark, the system won't respond to any call for heating or cooling, and you may blow a low-voltage fuse repeatedly. Replacing it with the correct OEM unit restores full factory control circuit function immediately.

• Specs: 40VA capacity | 208/230V primary input | 24V secondary output | 60Hz | Class 2 rated | Direct OEM replacement for part# HT01CN241
• OEM vs Generic: This OEM transformer is wound and insulated to Carrier's exact factory tolerance. Generic alternatives can vary in VA capacity and insulation rating, risking nuisance tripping, overheating, or premature control board failure.
• Install difficulty: 2/5 — Shut off all power to the unit at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wiring connections before disconnecting. Check and replace any blown low-voltage fuses before energizing the new transformer.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Engineered as a direct OEM fit for the Carrier PF4MNA019T00AAAA air handler. Verify the 208/230V primary and 40VA rating on your unit's data plate before ordering. If you're unsure about fitment, our HVAC parts specialists will confirm compatibility before you buy — no guesswork required. Order by 3PM and your part ships today.