OEM Carrier Control Transformer 40VA 120V/24V for Model C50A202761

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C50A202761 packaged unit. The transformer steps down line voltage (120V) to the 24V AC signal required to power your thermostat, contactor coil, control board, and all low-voltage safety circuits. When this transformer fails — due to a short in the control circuit, a blown internal fuse, or simple age — absolutely nothing responds: the thermostat goes dark, the system won't energize, and no components will operate. Replacing this transformer is typically the first diagnostic step when the entire low-voltage control circuit goes dead.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched output voltage for reliable thermostat and contactor operation
• OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage specifications. Generic transformers often run at reduced VA output, causing voltage sag under load that can trigger nuisance lockouts, damage control boards, or fail to fully pull in the contactor coil.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to verify 24V output after installation. Label and photograph all wiring connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship the same business day from our stocked warehouse.

Compatibility: Engineered for Carrier model C50A202761 commercial packaged rooftop units. Verify primary voltage and VA rating on your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment prior to purchase — order with confidence and get your system back online fast.