OEM Carrier 40VA Control Transformer HT01BD236 for Model C50A302752

This OEM replacement transformer (part number HT01BD236) is the factory-specified step-down transformer for the Carrier C50A302752 packaged unit. It converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control components. When this transformer fails, nothing in the control circuit responds — the thermostat goes blank, the unit won't call for heating or cooling, and the system appears completely dead despite having line power.

• Specs: 40VA rating | 120V primary / 24V secondary | Direct OEM replacement | Factory-matched impedance and thermal protection
• OEM vs Generic: OEM transformers like this HT01BD236 are wound to exact Carrier factory tolerances, ensuring stable 24V output under full control-circuit load. Generic transformers often under-deliver VA capacity, causing voltage sag that trips boards and contactors unpredictably.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter to verify 24V output after installation. Always confirm polarity and label wires before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C50A302752 commercial packaged rooftop unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If your system has multiple control-circuit loads (economizer, humidifier, etc.), confirm 40VA is sufficient for your configuration. Need help verifying fitment? Our HVAC parts specialists confirm compatibility before you order — reach out today and get this shipped to your door fast.