OEM Carrier Control Transformer 40VA 120V to 24V for Model CGH05012D

This is the OEM factory-replacement control transformer (part number HT01BC116) for the Carrier CGH05012D packaged or split-system unit. The transformer steps line voltage (120V) down to the 24V signal used by your thermostat, control board, and all low-voltage control circuit components. When this part fails, the entire control circuit goes dark — the thermostat becomes unresponsive, contactors won't energize, and the system will not heat or cool regardless of demand. A blown transformer is often caused by a short in the low-voltage wiring, so always inspect the 24V circuit before installing the replacement.

• Specs: 40VA rated | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01BC116 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: The OEM HT01BC116 transformer is wound and potted to Carrier's exact VA and insulation specifications. Generic transformers may be under-rated in sustained VA delivery, leading to premature burnout — especially on systems with multiple low-voltage zone valves or accessories.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wiring before disconnecting. Verify the short that caused original failure is resolved before powering up.
• Warranty: 1-year OEM factory warranty. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier CGH05012D. Always confirm primary input voltage and VA rating on your unit's data plate matches this transformer before ordering. If you are unsure of fit, our HVAC parts specialists are available to verify compatibility before you purchase — same-day shipping on all in-stock orders.