OEM Carrier Transformer 40VA 120V to 24V for Model FA4ANF030005AGAA

This OEM replacement transformer (part number HT01CN236) is the factory-specified control circuit transformer for the Carrier FA4ANF030005AGAA air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage system controls. When it fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system won't call for heating or cooling, and nothing works. A blown transformer is often caused by a shorted low-voltage wire or a failed control board, so always inspect the low-voltage circuit before installing a new unit.

• Specs: Input 120V AC | Output 24V AC | 40VA rating | OEM part number HT01CN236 | Factory-matched for Carrier FA4ANF030005AGAA air handlers
• OEM vs Generic: OEM transformers are wound to exact factory VA ratings, ensuring stable 24V output under full load. Undersized or off-tolerance generic units can overheat, trip internal breakers, or starve the control board — leading to repeat failures.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify secondary output (24V) with a multimeter after installation before closing the unit. Check for low-voltage short circuits first.
• Warranty: 1-year OEM factory warranty. Orders placed by 3 PM local time ship same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FA4ANF030005AGAA residential air handler. Cross-reference OEM part number HT01CN236 against your unit's data plate and wiring diagram to confirm fitment before ordering. Not sure it's the right part? Our HVAC parts specialists verify fitment before you buy — reach out before ordering.