OEM Carrier 40VA Control Transformer HT01CN241 for Model FX4DNF049L00ACAA

This OEM control transformer (part# HT01CN241) is the factory-specified replacement for the Carrier FX4DNF049L00ACAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, nothing in the system responds: the thermostat goes dark, the air handler won't energize, and the outdoor unit receives no call signal. A failed transformer is often misdiagnosed as a bad thermostat or control board, making it a critical first-check during a no-power service call.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Replaces OEM part number HT01CN241 | Factory-matched output tolerance for reliable low-voltage control
• OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and insulation class. Generic units may be undersized in practice, causing nuisance tripped fuses or burned secondary windings when multiple 24V loads are active simultaneously.
• Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdriver, multimeter, wire nuts or spade connectors. Verify 120V primary input and confirm 24V output before reconnecting the control circuit. Always check for shorted low-voltage wiring that may have caused the original failure.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FX4DNF049L00ACAA fan coil air handler. Verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. If your low-voltage fuse is blowing repeatedly, inspect all 24V wiring for shorts before installing the new transformer. Our parts specialists are available to confirm fitment — order with confidence and get back up and running today.