OEM Carrier Control Transformer 40VA 120V/24V for Model FA4CNC036008AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FA4CNC036008AAAA fan coil air handler. The transformer steps high-voltage line power (120V) down to the 24V signal voltage that powers your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — your thermostat goes blank, relays stop responding, and the system will not run in any mode. A failed transformer is often misdiagnosed as a bad thermostat or control board, making this an essential first diagnostic check.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 control transformer | Factory-matched OEM part HT01CN241 | Designed for Carrier fan coil air handlers
• OEM vs Generic: The OEM HT01CN241 transformer is wound to Carrier's exact VA and voltage tolerances, ensuring stable 24V output under full control-circuit load. Generic transformers frequently deliver inconsistent output voltage, causing nuisance lockouts, erratic board behavior, and premature low-voltage component failure.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Verify 120V input and 24V output with a multimeter after installation before restoring power. Label all low-voltage wires before disconnecting.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse — most orders arrive within 1–3 business days.

Compatibility: Engineered specifically for the Carrier FA4CNC036008AAAA fan coil air handler. Always verify your existing transformer's VA rating and voltage markings on the unit's data plate before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you buy — no guesswork required.