OEM Carrier Furnace Control Transformer 120V-24V 40VA for Model PG9MAA048080ABKA

This OEM control transformer (part number HT01BC116, updated to HT680054) is the factory-specified replacement for the Carrier PG9MAA048080ABKA 80% AFUE gas furnace. The transformer steps down 120V AC line power to the 24V AC signal required by every low-voltage component in the system — including the thermostat, gas valve, inducer relay, and control board. When the transformer fails, the entire control circuit goes dark: the thermostat goes blank, the furnace won't respond to a call for heat, and no error codes appear because the board itself has lost power.

• Specs: 40VA rating | 120V AC primary (110–125V range) | 24V AC secondary | Foot-mount bracket | Wire lead connections with pre-installed insulated female connectors
• OEM vs Generic: This is a factory-authorized OEM replacement built to exact Carrier specifications. Generic transformers frequently misalign mounting brackets, run marginal VA output under load, and lack the correct wire harness connectors — forcing risky modifications and risking nuisance tripping or board damage.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: multimeter, flathead and Phillips screwdriver, needle-nose pliers. Verify 24V output at secondary leads before buttoning up the panel. Always label or photograph existing wiring.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PG9MAA048080ABKA 80% AFUE gas furnace and cross-references a wide range of Carrier, Bryant, and Payne furnace models sharing the HT01BC116 / HT680054 specification. Also replaces: HT01BC116B, HT01BC115, HT01BB126, HT01BC120, and HT01AW115. Confirm your unit's control board accepts a 24V secondary and 40VA rating before ordering — check the data plate inside the furnace cabinet. Questions about fitment? Our HVAC parts specialists verify compatibility before you buy.