OEM Carrier 40VA Control Transformer HT01BD236 for Model C48A503052

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C48A503052 packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, control board, contactor coil, and all low-voltage control circuits. When this component fails, the entire control circuit goes dead — your thermostat will show no response, the system won't call for cooling or heating, and nothing will operate despite power being present at the unit.

• Specs: Input: 120V AC | Output: 24V AC | Capacity: 40VA | OEM Part Number: HT01BD236 | Factory-matched wire leads and mounting footprint
• OEM vs Generic: This is the genuine OEM Carrier transformer, wound to exact factory specifications for voltage regulation and thermal protection. Generic transformers often lack proper VA headroom and internal thermal fuses, leading to repeated failures under normal system load.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Label or photograph all low-voltage wire connections before removal.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C48A503052 packaged unit. Verify your existing transformer's input/output voltage and VA rating on the data plate before ordering. If your system shows no low-voltage control function at all, test this transformer first — it is the most common root cause. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order.