OEM Carrier 40VA Control Transformer for Model FA4ANC048008AGAA

This OEM control transformer (part# HT01CN236) is the factory-specified replacement for the Carrier FA4ANC048008AGAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, the thermostat goes completely dark, the system won't respond to any calls for heating or cooling, and nothing in the control circuit operates. A failed transformer is often mistaken for a bad thermostat or control board, making it one of the most important first-check components in any no-power diagnostic.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Hardwired lead connections | Factory-matched output impedance for Carrier control circuits
• OEM vs Generic: OEM transformers (HT01CN236) are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic transformers can cause nuisance tripping of the 3-amp fuse, erratic thermostat behavior, and premature control board failure.
• Install difficulty: 2/5 — Shut off all power at the breaker and disconnect switch before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Label or photograph existing wiring connections before removing the old transformer. Verify 24V output with a multimeter after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier FA4ANC048008AGAA fan coil air handler. Confirm your existing transformer's VA rating and primary/secondary voltage on the unit's data plate or wiring diagram before ordering. Our parts specialists are available to verify fitment — order with confidence and get back to comfort fast.