OEM Carrier 40VA Control Transformer for Model FA4ANF024008AFAA Air Handler

This OEM control transformer (part# HT01CN236) is the factory-specified replacement for the Carrier FA4ANF024008AFAA air handler. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and every other low-voltage component in the system. When it fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any call for heating or cooling, and no safety or staging functions operate. It is often the first component to check when nothing works but the unit has power.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN236 | Factory-matched output for stable 24V control circuit
• OEM vs Generic: The OEM HT01CN236 transformer is wound to exact factory VA and voltage tolerances, protecting downstream control boards and contactors from voltage fluctuations. Generic transformers with loose tolerances can under-deliver on VA load, causing nuisance lockouts or premature board failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring connections before removal. Verify 24V output with a multimeter after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed by 3PM local time ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FA4ANF024008AFAA fan coil air handler. Always confirm your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Our HVAC parts specialists are available to verify fitment — reach out before you order if you have any questions. In stock and ready to ship today.