OEM Carrier 40VA Control Transformer HT01BC208 for Model P1011200A

This OEM control transformer is the factory-specified replacement for the Carrier P1011200A system. The transformer steps down 120V line voltage to the 24V signal required by the thermostat, control board, and all low-voltage components. When this part fails, absolutely nothing in the control circuit responds — the thermostat goes dark, no heating or cooling calls are processed, and the system sits completely dead despite power being present at the unit.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory OEM part number HT01BC208 | Exact factory mounting footprint and terminal configuration
• OEM vs Generic: The OEM HT01BC208 transformer is wound to Carrier's exact VA rating and insulation class, ensuring the control board and thermostat receive stable, clean 24V power. Generic transformers often run under-rated VA, causing nuisance tripped fuses and premature control board failure under full load.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph all low-voltage wiring before disconnecting terminals.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement transformer for Carrier model P1011200A. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering to confirm fitment. Have questions about compatibility? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.