OEM Carrier 40VA Control Transformer HT01CN241 for Model FA4BNC060010AAAA

This is the factory-specified OEM replacement transformer (part# HT01CN241) for the Carrier FA4BNC060010AAAA air handler. The transformer is the backbone of your unit's low-voltage control circuit — it steps line voltage (120V) down to 24V AC to power the thermostat, control board, and all relay coils. When this part fails, the entire control circuit goes dark: your thermostat loses communication, the system won't respond to any commands, and nothing turns on. A blown fuse on the secondary side is a common symptom pointing directly to transformer failure or a downstream short.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched for Carrier FA4BNC060010AAAA air handlers
• OEM vs Generic: This OEM transformer is wound to exact Carrier specifications, ensuring correct VA capacity and stable 24V output under load. Generic transformers are often under-rated in VA, causing overheating, nuisance tripping, and premature failure — especially when multiple zones or accessories are connected.
• Install Difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Photograph all wiring before disconnecting. Check for downstream shorts (shorted thermostat wire, stuck contactor coil) before installing the new transformer to prevent repeat failure.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier FA4BNC060010AAAA air handler. Verify your existing transformer's primary and secondary voltage ratings as well as VA rating on the unit's data plate or wiring diagram before ordering. If you are unsure of fitment, our parts specialists can verify compatibility before you buy — no guesswork required.