OEM Carrier 40VA Control Transformer HT01CN241 for Model FX4DNF031L00ABAA

This OEM control transformer (part# HT01CN241) is the factory-specified replacement for the Carrier FX4DNF031L00ABAA air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage safety circuits. When it fails, nothing in your system responds — the thermostat goes blank, the blower won't start, and no call for heating or cooling will be answered. A failed transformer is often misdiagnosed as a control board failure, making correct diagnosis critical before replacing more expensive components.

• Specs: 40VA rating | 120V primary / 24V secondary | Direct OEM replacement | Factory-matched output tolerance for stable low-voltage control circuits
• OEM vs Generic: OEM transformers like this HT01CN241 are wound to Carrier's exact VA and voltage specifications. Generic units frequently deliver unstable 24V output, causing nuisance lockouts, erratic thermostat behavior, and premature control board failure.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify incoming 120V is de-energized before disconnecting wire leads. Photograph all wiring before removal.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FX4DNF031L00ABAA fan coil air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering to ensure a correct fit. Have your model number and OEM part number ready — our team is available to confirm fitment before you purchase.