OEM Carrier Control Transformer 40VA for Model FB4ANF036008AFAA

This is the factory OEM replacement transformer (part# HT01CN236) for the Carrier FB4ANF036008AFAA air handler. The control transformer steps down line voltage from 120V to 24VAC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dead: your thermostat goes blank, the system won't respond to any calls for heating or cooling, and nothing turns on. It's often the first component to check when a system shows zero signs of life despite having line power at the unit.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | OEM part number HT01CN236 | Factory-matched for Carrier FB4ANF036008AFAA air handlers
• OEM vs Generic: This is the exact factory-specified transformer. OEM units are wound and insulated to Carrier's tolerances, ensuring stable 24V output under full load. Generic transformers often run outside rated VA capacity, causing premature failure, nuisance tripping, or erratic thermostat behavior.
• Install difficulty: 2/5 — Always shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdriver, multimeter, wire nuts or terminal connectors. Confirm 24VAC output with a meter before closing the unit. Photograph all wiring before disconnecting.
• 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 for the Carrier FB4ANF036008AFAA fan coil/air handler. Always verify your unit's control voltage and VA requirement on the data plate before ordering. If you're unsure of fitment, our HVAC parts specialists verify compatibility before you buy — no guesswork required. Order today and your part ships today.