OEM Carrier 40VA Control Transformer for Model FX4DNF049000ABAA Air Handler

This is the factory OEM replacement transformer (part# HT01CN241) for the Carrier FX4DNF049000ABAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the result is a completely unresponsive system: the thermostat goes blank, the air handler refuses to start, and no 24V signal reaches any component downstream. A blown fuse on the secondary side or a shorted control wire can also take out the transformer, so always check for shorts before installing a replacement.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Hardwired leads | OEM part number HT01CN241 | Factory-matched to Carrier FX4DNF049000ABAA electrical specifications
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic units can overheat, trip thermal cutouts prematurely, or deliver unstable 24V that causes erratic thermostat and board behavior.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is off before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Measure 24V output on the secondary leads before buttoning up the air handler to confirm proper operation.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FX4DNF049000ABAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our parts specialists are available to confirm fitment — contact us before you order if you have any questions. In stock and ready to ship today.