OEM Carrier 40VA Control Transformer for Model C50A402552

This OEM replacement control transformer (part# HT01BD236) is the factory-specified unit for the Carrier C50A402552 packaged system. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When it fails, the entire control circuit goes dark — your thermostat goes blank, the system won't respond to calls for heating or cooling, and no safety lockouts can even register. It is often the first component to check when nothing works at all.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Replaces OEM part number HT01BD236
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Generic transformers often under-deliver on VA capacity, causing overheating under full control-circuit load and premature failure — especially in systems with multiple zone valves or accessories drawing 24V power.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is off before removing wire leads. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all wires before disconnecting. Secondary short-circuit protection may need to be reset after installation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C50A402552 commercial packaged rooftop unit. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Our parts specialists are available to confirm fitment — just reach out before you buy. Order now and receive same-day shipping on all in-stock OEM parts.