OEM Carrier 40VA Control Transformer for Model C4850C50ZG050600

This OEM replacement transformer (part# HT01BD236) is the factory-specified control circuit transformer for the Carrier C4850C50ZG050600 packaged unit. Its job is to step down line voltage (120V) to the 24V signal voltage that powers your thermostat, contactor coil, control board, and every safety switch in the system. When this transformer fails, nothing in the control circuit responds — the system will appear completely dead despite power being present at the unit. A failed transformer often presents as a tripped secondary fuse or a burned plastic smell near the control box.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched impedance and thermal protection for Carrier packaged equipment
• OEM vs Generic: OEM transformers are wound and potted to Carrier's exact VA rating and thermal cutout threshold. Undersized or off-brand transformers can overheat, nuisance-trip, or fail prematurely when multiple control loads are present simultaneously.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output after installation before closing the control panel. Always check for a shorted downstream load (stuck contactor coil, damaged wiring) that may have caused the original failure.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C4850C50ZG050600 packaged gas/electric unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering. Our fitment team is available to verify compatibility before you purchase — same-day shipping available on orders placed before 3 PM local time.