OEM Carrier Transformer 40VA 120V to 24V for Model GA2AAD036070AAJA

This is the factory OEM replacement transformer (part# HT01BC116) for the Carrier GA2AAD036070AAJA packaged unit. The control transformer steps down 120V line voltage to the 24V signal required by your thermostat, contactor coil, and all low-voltage control circuits. When this transformer fails, the entire control circuit loses power — your thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no staging sequence can begin. A blown transformer is also often a symptom of a downstream short, so always inspect low-voltage wiring before installing the replacement.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | Factory-matched OEM part number HT01BC116 | Designed for continuous-duty HVAC control circuit operation
• OEM vs Generic: This OEM unit is wound to exact VA and voltage tolerances specified by Carrier engineering. Generic transformers often run under-rated VA, causing premature thermal cutout failure — especially under high-demand multi-zone control loads.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before proceeding. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Confirm secondary voltage output with a multimeter before closing the panel.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier GA2AAD036070AAJA packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If you're unsure of fitment, our HVAC parts team will confirm compatibility before you buy — no guesswork required.