OEM Carrier 40VA Transformer HT01CN236 for Model FE4ANF003000AAAA

This OEM replacement transformer (part number HT01CN236) is the factory-specified control circuit transformer for the Carrier FE4ANF003000AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, and all low-voltage safety controls. When this component fails, the entire control circuit goes dark — your thermostat loses power, the system won't respond to any command, and no heating or cooling stages will activate. If your system is completely unresponsive and you've ruled out a tripped breaker or blown fuse, a failed transformer is the most likely culprit.

• Specs: 40VA rating | 120V primary / 24V secondary | Direct OEM replacement for part number HT01CN236 | Factory-matched output tolerance for stable low-voltage control
• OEM vs Generic: This is the genuine Carrier OEM transformer — wound and tested to factory specifications. Generic transformers may produce slightly off-target secondary voltages that cause erratic thermostat behavior, nuisance trips, or premature control board failure.
• Install difficulty: 2/5 — Turn off power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter to verify output voltage after install. Label or photograph all wiring connections before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier FE4ANF003000AAAA fan coil air handler. Always verify 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 — reach out before you order if you have any questions.