OEM Carrier 40VA Transformer HT01CN241 for Model FX4CNB036000AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FX4CNB036000AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V signal that powers your thermostat, control board, and all low-voltage safety and switching circuits. When this component fails, nothing in your system responds — the thermostat goes blank, the air handler won't energize, and no heating or cooling call is processed. A failed transformer is often mistaken for a thermostat or control board problem, making correct diagnosis critical before replacement.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory-matched OEM part number HT01CN241 | Direct drop-in replacement
• 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 cutoffs prematurely, or cause erratic low-voltage behavior across your system.
• Install difficulty: 2/5 — Shut off all power to the air handler at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to confirm 0V before touching terminals and verify 24V output after install). Photograph all wiring connections before disconnecting.
• Warranty: 1-year OEM factory warranty. Order before 3PM and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FX4CNB036000AAAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our HVAC parts specialists are available to confirm fitment — just reach out before you order. In stock and ready to ship today.