OEM Carrier 40VA Control Transformer for Model FX4DNF031000ABAA

This OEM control transformer (part# HT01CN241) is the factory-specified replacement for the Carrier FX4DNF031000ABAA fan coil air handler. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — your thermostat will show no response, the system won't call for heating or cooling, and no components will energize. A blown transformer is often caused by a short in the low-voltage wiring, so always inspect the 24V circuit before installing the replacement.

• Specs: 40VA rating | 120V primary input | 24V secondary output | Direct OEM replacement for part# HT01CN241 | Compatible with standard low-voltage control circuits
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic transformers may deliver inconsistent secondary voltage, causing nuisance lockouts, erratic thermostat behavior, or premature control board failure.
• Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after installation). Always confirm no short exists in the low-voltage wiring before energizing the new transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier FX4DNF031000ABAA fan coil air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering to confirm fitment. Have questions about fit? Our HVAC parts specialists verify compatibility before you buy — contact us anytime.