OEM Carrier Control Transformer 40VA for Model FX4ANF030000ACAA Air Handler

This OEM Carrier transformer (part# HT01CN236) is the factory-specified step-down control transformer for the FX4ANF030000ACAA fan coil air handler. It converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control circuitry. When this transformer fails, the entire control circuit goes dead — the thermostat loses power, the system refuses to respond to any call for heating or cooling, and nothing operates. A failed transformer is often misdiagnosed as a control board issue, so always verify 24V output at the secondary terminals before replacing more expensive components.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched for FX4ANF030000ACAA air handler control circuit
• OEM vs Generic: This OEM unit is wound to exact VA and voltage tolerances required by the Carrier FX4ANF030000ACAA control board. Undersized or off-spec generic transformers can overheat, blow internal fuses, or deliver inconsistent 24V output that causes nuisance lockouts and relay chatter.
• Install difficulty: 2/5 — Turn off all power (line and low-voltage) before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Test for 24V output at secondary terminals after installation before closing the unit. Photograph all wiring connections before removal.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse — no backorder delays.

Compatibility: Designed as a direct OEM replacement for the Carrier FX4ANF030000ACAA fan coil air handler. Confirm your unit's data plate lists a 40VA, 120V/24V control transformer before ordering. Our HVAC parts specialists are available to verify fitment — reach out before you order if you have any questions. Order today and your part ships the same business day.