OEM Carrier 40VA Control Transformer for Model FB4CNF060000ABAA

This OEM Carrier control transformer (part# HT01CN241) is the factory-specified replacement for the FB4CNF060000ABAA air handler. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, and all low-voltage control components. When this part fails, the entire control circuit goes dead — your thermostat loses power, the system becomes completely unresponsive, and neither heating nor cooling will operate. A failed transformer is often caused by a wiring short in the low-voltage circuit, so always inspect thermostat wiring and control board terminals before installing a replacement.

• Specs: 40VA rating | 120V primary input | 24V secondary output | Factory-matched OEM construction | Direct drop-in replacement for part# HT01CN241
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage tolerances, ensuring stable 24V output under full control-circuit load. Generic transformers may under-deliver VA capacity, causing nuisance tripping or premature failure when multiple control components draw simultaneously.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Photograph all wiring before disconnecting. Check secondary output voltage with a multimeter after installation to confirm 24V before restoring full power.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FB4CNF060000ABAA air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy — no guesswork, no returns.