OEM Carrier 40VA Control Transformer HT01CN236 for Model FX4ANF048000ABAA

This is the factory OEM replacement transformer (part number HT01CN236) for the Carrier FX4ANF048000ABAA air handler. The control transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, control board, contactor coil, and zone controls. When it fails, the entire control circuit goes dead: your thermostat loses power, the system won't respond to calls for heating or cooling, and no status LEDs illuminate on the control board. A failed transformer is often misdiagnosed as a bad control board, so always test transformer output with a multimeter first.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched to Carrier FX4ANF048000ABAA air handler control circuit
• OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage specifications, ensuring stable 24V output under full load. Undersized or off-spec generic transformers can overheat, blow fuses repeatedly, or cause erratic thermostat behavior.
• Install difficulty: 2/5 — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring before disconnecting. Primary wires connect to line voltage terminals; secondary wires connect to 24V control circuit terminals (typically R and C).
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier FX4ANF048000ABAA 4-ton residential air handler. Confirm transformer VA rating and primary voltage on your unit's data plate or wiring diagram before ordering. Not sure if this part fits your exact configuration? Our HVAC parts specialists verify fitment before you order — contact us and we'll confirm within minutes.