OEM Carrier 40VA Control Transformer for Model FV4ANF003000ADAA Air Handler

This OEM replacement transformer (part number HT01CN236) is the factory-specified control transformer for the Carrier FV4ANF003000ADAA fan coil air handler. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, and every relay in the system. When the transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any commands, and no heating or cooling operation is possible. A failed transformer is often mistaken for a bad thermostat or control board, making correct diagnosis critical before replacing costlier components.

• Specs: 40VA rating | 120V primary input | 24V secondary output | Class 2 transformer | OEM part number HT01CN236 | Factory-matched for Carrier FV4ANF003000ADAA air handler
• OEM vs Generic: This OEM transformer is wound to exact factory VA specifications, ensuring stable 24V output under full control-circuit load. Undersized or off-tolerance generic transformers can cause nuisance tripping, erratic thermostat behavior, and premature contactor coil failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Note wire terminal positions before disconnecting. Replacement typically takes 20–30 minutes.
• Warranty: 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed specifically for the Carrier FV4ANF003000ADAA fan coil air handler. Verify your unit's control voltage and VA requirements on the data plate before ordering. If you're unsure about fitment, our HVAC parts specialists can confirm compatibility before you purchase — no guesswork, no returns.