OEM Carrier 40VA Control Transformer for Model FY4ANF048010AAAA (HT01CN241)

This is the genuine OEM replacement control transformer for the Carrier FY4ANF048010AAAA air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, no heating or cooling calls are processed, and the system appears completely unresponsive. Replacing the transformer is often the fastest and most affordable fix before condemning an expensive control board.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01CN241 | Factory-matched output for stable low-voltage control signal
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or out-of-tolerance generic units can cause nuisance tripping, board damage, or erratic thermostat behavior over time.
• Install difficulty: 2/5 — Turn off all power to the air handler before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Verify 24V output with a multimeter after install before restoring full power. Always label wires before disconnecting.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Carrier FY4ANF048010AAAA air handler. Cross-reference OEM part number HT01CN241 against your unit's data plate and wiring diagram before ordering. If you are unsure of fitment, our HVAC parts specialists can verify compatibility before your order ships — no guesswork required.