OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG8MAA048110ABJA (Replaces HT01BC116)

This is the OEM factory-authorized step-down control transformer for the Carrier PG8MAA048110ABJA gas furnace. The transformer converts 120V line voltage down to 24V AC to power all low-voltage control-circuit components — including the thermostat, gas valve, inducer relay, and ignition control board. When this transformer fails, the entire low-voltage circuit goes dead: the thermostat display may go blank, the furnace will not respond to a call for heat, and no control-board LED activity will be present. OEM part number HT01BC116 has been superseded by the current factory replacement HT680054, which ships in a Carrier factory-authorized parts box and is a direct drop-in swap.

• Specs: Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 50/60 Hz | Phase: Single | Mounting: Foot-mount with wire leads | Dimensions: approx. 3″ L × 2-3/16″ W × 2″ H
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory tolerances, ensuring stable 24V output under all load conditions. Generic units frequently ship with looser voltage regulation, which can cause nuisance lockouts, thermostat errors, and premature control-board failure — especially in multi-stage systems like the PG8MAA048110ABJA.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after installation). Photograph all wiring connections before disconnecting. The foot-mount bracket secures with two screws; wire leads use pre-installed insulated female quick-connects for a clean, tool-free termination.
• Warranty: 1-year OEM manufacturer's warranty. In-stock units ship same business day when ordered by 5 PM local time.

Compatibility: Fits Carrier PG8MAA048110ABJA gas furnaces and other Carrier, Bryant, and Payne models specifying a 120V–24V 40VA transformer. This part supersedes OEM numbers HT01BC116, HT01BC116B, HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, HT01AA012, HT01AQ110, and HT01CT210. Confirm your unit's control-circuit voltage and VA requirement on the wiring diagram or data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.