OEM Carrier 40VA Control Transformer for Model P10214B (Part# HT01BC116)

This OEM control transformer is the factory-specified replacement for the Carrier P10214B system, sold under OEM part number HT01BC116. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage control circuits. When the transformer fails, absolutely nothing in the system responds — the thermostat goes dark, the contactor won't pull in, and no heating or cooling calls are processed. It is often the first component to check when a system appears completely dead despite line power being confirmed at the unit.

• Specs: 40VA rated | Primary: 120V | Secondary: 24V | Class 2 insulation | Hardwired lead connections | Compact form factor for tight control compartments
• OEM vs Generic: The OEM HT01BC116 transformer is wound and rated to Carrier's exact VA and insulation specifications. Generic transformers frequently underrate VA capacity, causing thermal overload trips when multiple 24V accessories (humidifiers, zone boards, communicating stats) place simultaneous draws on the secondary.
• Install difficulty: 2/5 — Shut off all power before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Verify 120V primary input and 24V secondary output with your meter before and after replacement. Photograph existing wire connections before disconnecting.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier P10214B system using OEM part number HT01BC116. Always verify your existing transformer's VA rating, primary voltage, and secondary voltage from the data plate before ordering to ensure a direct fit. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy.