OEM Carrier Control Transformer 40VA 120V/24V for Model PG8MAA048070ABJA (Replaces HT01BC116)

This OEM control transformer is the factory-specified replacement for the Carrier PG8MAA048070ABJA gas furnace. The transformer steps down 120V line voltage to the 24V signal voltage required to power the control board, thermostat circuit, and all low-voltage safety controls. When the transformer fails, the furnace goes completely unresponsive — the thermostat shows no connection, the control board has no power, and there is zero call-for-heat activity. Replacing this part is often the first diagnostic step when the furnace is completely dead with no error codes displayed.

• Specs: 40VA rating | 120V primary | 24V secondary | 50/60 Hz single-phase | Compact chassis-mount design | Direct OEM replacement for part number HT01BC116 (superseded by HT680054)
• OEM vs Generic: OEM transformers are wound to exact Carrier factory tolerances, ensuring stable 24V output under full control-circuit load. Off-brand units often under-deliver VA capacity, causing nuisance lockouts and premature control board failure.
• Install difficulty: 2/5 — Shut off power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to confirm 24V output after install). Label or photograph all low-voltage wiring before disconnecting. Most technicians complete this repair in under 30 minutes.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PG8MAA048070ABJA gas furnace. Also compatible with a broad range of Carrier, Bryant, and Payne furnace models requiring a 40VA 120V-24V step-down transformer. Always verify your unit's data plate voltage and VA requirements before ordering. Our fitment team is available to confirm compatibility — reach out before you order if you have any questions.