OEM Carrier Transformer 40VA 120V/24V for Model C50A303552

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C50A303552 commercial rooftop unit. The transformer steps down line voltage from 120V to the 24V AC signal required to power the control board, thermostat, contactor coils, and all low-voltage control components. When this transformer fails, absolutely nothing works — the thermostat goes dark, the unit won't respond to any call for heating or cooling, and you may measure zero voltage on the secondary side of the control circuit.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | HT01BD236 OEM part number | Compact multi-tab mount design for direct drop-in replacement
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory specifications, ensuring proper VA capacity and thermal protection. Generic alternatives may be undersized in VA rating, causing overload tripping and nuisance lockouts under full control circuit load.
• Install difficulty: 2/5 — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Note wire colors and terminal positions before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our stocked warehouse.

Compatibility: Designed for the Carrier C50A303552 commercial packaged rooftop unit. Always verify primary voltage and VA rating on your unit's wiring diagram or data plate before ordering. If your control circuit is consistently blowing the transformer, check for shorted thermostat wiring or a faulty contactor coil before installing the replacement. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you order — reach out before checkout.