OEM Carrier 40VA Step-Down Transformer (HT01BC116 / HT680054) for Model PG8JAA036110ACJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8JAA036110ACJA gas furnace. The transformer converts 120V line voltage to the 24V AC signal that powers all low-voltage control components — including the thermostat, gas valve, inducer relay, and IFC control board. When it fails, the entire control circuit goes dark: your thermostat loses power, nothing responds at the board, and the furnace will not attempt to start. It is often one of the first parts to suspect when a furnace appears completely dead with no error codes.

• Specs: Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 50/60 Hz | Phase: Single | Mounting Type: Foot mount | Connection: Wire leads with insulated female quick-connects
• OEM vs Generic: This is a genuine OEM Carrier replacement (superseded part HT680054), manufactured to exact factory tolerances. Generic transformers frequently lack proper VA headroom and can overheat or fail under the combined load of gas valve, board, and thermostat — risking damage to downstream low-voltage components.
• Install difficulty: 2/5 — Shut off power at the breaker before starting. Photograph all wiring connections before disconnecting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Check for a blown 3A inline fuse on the secondary side — a shorted wire downstream often kills transformers and should be resolved before replacing.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Fits Carrier model PG8JAA036110ACJA gas furnace. OEM part number HT01BC116 has been officially superseded by Carrier part number HT680054 — this listing ships the current OEM replacement. Also replaces HT01BC115, HT01BB126, HT01CT120, HT01BC120, and several other legacy Carrier/Bryant/Payne transformer part numbers. Verify 120V primary input voltage on your unit's data plate before ordering. Our team is happy to confirm fitment — reach out before you buy.