OEM Carrier Transformer 40VA 120V to 24V for Model FF1DNA024011AAAA

This is the factory OEM replacement transformer (part number HT01CN236) for the Carrier FF1DNA024011AAAA air handler. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, control board, and all low-voltage control wiring. When this component fails, the entire control circuit goes dead — the thermostat display may go blank, the system will not respond to any calls for heating or cooling, and nothing will operate despite the unit receiving full power.

• Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01CN236 | Factory-matched to Carrier FF1DNA024011AAAA air handler control circuit requirements
• OEM vs Generic: This is the genuine OEM Carrier transformer manufactured to exact factory specifications. Generic transformers may carry insufficient VA ratings, causing premature burnout under normal load from multiple low-voltage accessories such as humidifiers, zone controllers, and UV lights.
• Install difficulty: 2/5 — Always disconnect power before servicing. Tools needed: flathead and Phillips screwdriver, needle-nose pliers, multimeter (to confirm 24V output after install). Label all low-voltage wires before disconnecting. Primary and secondary terminals are typically labeled; verify polarity matches original unit.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed specifically for the Carrier FF1DNA024011AAAA air handler. Verify your existing transformer's VA rating and primary/secondary voltage from the data plate or original part label before ordering. If your low-voltage circuit is consistently blowing fuses or burning transformers, inspect for wiring shorts before replacement. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions.