OEM Carrier 40VA Control Transformer HT01CN241 for Model FY4ANF030T00AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FY4ANF030T00AAAA fan coil unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers the thermostat, control board, and all low-voltage switching components throughout the system. When this transformer fails, the result is a completely unresponsive system — the thermostat goes dark, relays won't energize, and no heating or cooling function is possible. It is one of the most commonly overlooked components when diagnosing a system that appears completely dead.

• Specs: Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01CN241 | Factory-matched output tolerance for stable low-voltage control
• OEM vs Generic: This OEM unit is wound and tested to Carrier's exact 40VA specification. Generic transformers frequently run under-rated VA capacity, causing premature burnout when multiple low-voltage accessories (humidistats, zone boards, UV lights) share the circuit load.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Confirm primary and secondary voltage readings after install before closing the panel.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Direct OEM replacement for Carrier model FY4ANF030T00AAAA fan coil units. Verify your existing transformer's input voltage, output voltage, and VA rating on the unit data plate or existing component label before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — no guesswork required.