OEM Carrier Control Circuit Transformer 40VA for Model FX4CNF030000AAAA

This OEM replacement transformer (part# HT01CN241) is the factory-specified step-down transformer for the Carrier FX4CNF030000AAAA fan coil air handler. It converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, relays, and all low-voltage control circuit components. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any commands, and nothing operates regardless of thermostat settings.

• Specs: 40VA rated | 120V primary input | 24V secondary output | Direct OEM replacement | Part number HT01CN241 | Factory-matched output tolerances for stable control voltage
• OEM vs Generic: OEM transformers like this HT01CN241 are wound and tested to Carrier's exact VA and voltage specifications, ensuring your control board receives clean, stable 24V. Generic units frequently deliver unstable output voltage that can damage sensitive control boards and communicating thermostats — costing far more to repair.
• Install difficulty: 2/5 — Shut off all power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Photograph all wiring connections before disconnecting. Verify 24V output with a multimeter after installation before closing the unit.
• Warranty: 1-year OEM factory warranty. Leaves our warehouse the same business day when ordered before 3PM.

Compatibility: Designed specifically for the Carrier FX4CNF030000AAAA fan coil air handler. Cross-reference your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — just reach out before you order. In stock and ships same day.