OEM Carrier Control Transformer 40VA for Model C50A302061

This OEM replacement transformer (part# HT01BD236) is the factory-specified control transformer for the Carrier C50A302061 commercial rooftop unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coils, and all other low-voltage control circuit components. When this transformer fails, the entire control circuit loses power — the result is a completely unresponsive system with no thermostat communication, no staging, and no operation whatsoever. A failed transformer is often misdiagnosed as a bad thermostat or control board, making correct identification critical before replacing more expensive components.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched impedance | OEM part number HT01BD236 | Designed for commercial rooftop application
• OEM vs Generic: This factory OEM transformer meets exact VA rating and insulation class specifications for the C50A302061. Generic transformers frequently underrate their actual VA capacity, causing overheating and premature failure — especially under the higher control circuit loads typical of commercial rooftop units.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always verify 0V at primary terminals before touching wiring. Document lead colors and terminal positions with a photo prior to disconnecting the old unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C50A302061 commercial packaged rooftop unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering to ensure proper fitment. Our HVAC parts specialists are available to confirm compatibility before you buy — don't guess on a commercial job. Order now for same-day shipping.