OEM Carrier Transformer 40VA 120V to 24V for Model FA4ANF048015AGAA

This is the factory OEM replacement transformer (part number HT01CN236) for the Carrier FA4ANF048015AGAA air handler. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, and all low-voltage control circuits. When this component fails, the entire system goes silent — thermostat display goes dark, no heating or cooling response, and no error codes because the board itself loses power. If you've already verified your thermostat and control board are functional, a failed transformer is typically the culprit.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN236 | Factory-matched output tolerance for stable low-voltage operation
• OEM vs Generic: The OEM HT01CN236 transformer is wound to exact Carrier factory specifications, ensuring consistent 24V output under varying load conditions. Generic transformers frequently fall short of rated VA capacity, causing nuisance tripping of the built-in thermal overload and premature failure under normal system demand.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 0V before touching wiring). Photograph all wire connections before disconnecting. The transformer mounts to the air handler cabinet with two screws; low-voltage leads connect to the control board terminal strip.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocking warehouse.

Compatibility: Designed specifically for the Carrier FA4ANF048015AGAA 4-ton air handler. Cross-reference OEM part number HT01CN236 against your unit's data plate and existing transformer label before ordering to confirm VA rating and voltage match. Our parts specialists are available to verify fitment — reach out before you order if you have any questions. In stock and ready to ship today.