OEM Carrier Control Transformer 40VA 120V/24V for Model CGH07512D

This OEM replacement transformer (part number HT01BC116) is the factory-specified step-down transformer for the Carrier CGH07512D packaged unit. Its job is critical but simple: convert 120V line voltage into the 24V signal that powers your thermostat, contactor coils, and control board. When this transformer fails, the entire low-voltage control circuit goes dark — your thermostat loses power, the system refuses to respond to any call for heating or cooling, and you may blow a 3A control fuse repeatedly. A failed transformer is one of the most common causes of a completely unresponsive HVAC system.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Hardwired leads | Factory-matched impedance and VA rating for the CGH07512D control circuit
• OEM vs Generic: This is a genuine Carrier OEM part (HT01BC116), manufactured to exact VA and voltage tolerances. Generic transformers with mismatched VA ratings can overload and fail within one season, or cause nuisance fuse blowing and erratic control board behavior.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter. Label or photograph all wiring connections before disconnecting. Verify output voltage with a multimeter after installation to confirm 24V ±10%.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement transformer for the Carrier CGH07512D packaged unit. Always verify the existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before your order ships — no guesswork required.