OEM Carrier 40VA Control Transformer HT01BD236 for Model C48A203052

This is the factory OEM replacement transformer (part number HT01BD236) for the Carrier C48A203052 packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, contactor coil, gas valve, and control board. When the transformer fails, the entire control circuit goes dead — your thermostat loses power, nothing responds, and the system won't start in either heating or cooling mode. If you've already ruled out a blown fuse or tripped breaker, a failed transformer is the most common cause of a completely unresponsive unit.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched OEM tolerances | Designed for Carrier C48A203052 packaged unit control circuit
• OEM vs Generic: OEM transformers like this HT01BD236 are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-spec generic transformers can overheat, blow fuses repeatedly, or cause erratic board behavior — costing you far more in callbacks and parts.
• Install difficulty: 2/5 — Disconnect power at the disconnect box and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wiring connections before removal. Most technicians complete this replacement in under 30 minutes.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse — order by 3PM local time.

Compatibility: This transformer is the OEM-specified replacement for the Carrier C48A203052 packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — no guesswork.