OEM Carrier 40VA Control Transformer HT01CN241 for Model FY4ANF042010AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FY4ANF042010AAAA air handler. Its job is to step down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching components. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any commands, and nothing runs. If you've already confirmed 120V supply to the unit but have no 24V output at the secondary terminals, this transformer is the most likely culprit.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched output tolerance for reliable low-voltage control
• OEM vs Generic: This is a genuine OEM Carrier transformer, wound and insulated to exact factory specifications. Generic transformers may carry undersized VA ratings or looser voltage tolerances, leading to nuisance tripped breakers, control board brownouts, or premature transformer burnout.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all wiring before disconnecting — primary (black/white) and secondary (red/common) leads must not be swapped.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier FY4ANF042010AAAA 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 — order with confidence and get back up and running today.