OEM Carrier 40VA Control Transformer HT01CN236 for Model FE5ANB004L00ABAA

This OEM replacement transformer (part# HT01CN236) is the factory-specified control circuit transformer for the Carrier FE5ANB004L00ABAA air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching components. When this part fails, the entire control circuit goes dark — your thermostat loses power, the system becomes completely unresponsive, and no heating or cooling operation is possible. A failed transformer is often misdiagnosed as a bad control board, so always verify 24V output at the secondary terminals before replacing more expensive components.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched impedance and thermal protection
• OEM vs Generic: This OEM unit is wound to exact factory specifications, ensuring stable 24V output under full load. Generic transformers frequently undervolt under load, causing intermittent lockouts, nuisance tripping, and premature control board failure.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Verify 120V input and 24V output with a multimeter after installation before closing the panel. Always check for a blown 3A fuse on the control board, as a shorted transformer often takes the fuse with it.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FE5ANB004L00ABAA air handler. Confirm your unit's control circuit voltage and VA requirements on the data plate inside the access panel before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get your system back online fast.