OEM Carrier 40VA Control Transformer for Model FA4ANF030008AGAA

This OEM replacement transformer (part# HT01CN236) is the factory-specified control circuit transformer for the Carrier FA4ANF030008AGAA air handler. It steps down line voltage (120V) to the 24V signal voltage required by the thermostat, control board, contactor coil, and all low-voltage controls throughout the system. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, nothing responds, and the system will not start in any mode. It is one of the first components to check when a system shows zero response despite confirmed line-voltage power at the unit.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN236 | Factory-matched to Carrier FA4ANF030008AGAA air handler control circuit requirements
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Generic transformers may run under-rated VA loads, causing overheating, nuisance tripping, or premature control board failure — particularly under high-demand multi-zone thermostat wiring.
• Install difficulty: 2/5 — Shut off all power at the breaker and disconnect switch before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring connections before removal. Verify 24V output with a multimeter after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled parts warehouse.

Compatibility: Designed and factory-matched for the Carrier FA4ANF030008AGAA air handler. Always confirm your unit's data plate voltage requirements match 120V primary / 24V secondary 40VA before ordering. Our parts specialists are available to verify fitment — order with confidence and get back to comfort fast.