OEM Carrier 40VA Control Transformer for Model P1012000A — Part HT01BC208

This OEM control transformer is the factory-specified replacement for the Carrier P1012000A system. The transformer steps down 120V line voltage to the 24V signal used by the thermostat, control board, contactor coil, and every other low-voltage component in your system. When it fails, the entire control circuit goes dark — your thermostat goes blank, nothing responds to a call for heat or cooling, and the system appears completely dead even though line power is present.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BC208 | Factory-matched construction for full compatibility with Carrier control circuits
• OEM vs Generic: This OEM transformer is wound and insulated to Carrier's exact VA and voltage tolerances. Undersized or off-spec generic transformers can sag under load, cause erratic board behavior, or fail prematurely — especially in systems with zone valves or multiple accessories drawing 24V power.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminal connectors, multimeter to verify output voltage after install. Label or photograph existing wiring before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model P1012000A. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering to ensure proper fit. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — contact us anytime.