OEM Carrier Furnace Control Transformer 40VA 120V–24V for Model PG8UAA060155ADJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8UAA060155ADJA gas furnace. Mounted inside the furnace cabinet, it steps down the 120-volt line voltage to the 24-volt AC signal that powers the thermostat, gas valve, inducer relay, and all other low-voltage control circuit components. When it fails, absolutely nothing responds — the thermostat goes dark, the inducer won't start, and there are no error codes because the control board itself has lost power. A failed transformer is one of the most commonly misdiagnosed "dead furnace" causes.

• Specs: 40VA rating | 120V AC primary | 24V AC secondary | 60Hz | Wire lead connections | Foot-mount configuration | Replaces OEM part numbers HT01BC116, HT01BC116B, HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT680054
• OEM vs Generic: This is a genuine OEM-grade factory replacement. Generic transformers often have imprecise VA ratings and mounting mismatches — one technician note confirmed a generic unit would not mount correctly without modification. OEM units install cleanly with zero modifications.
• Install difficulty: 2/5 — Shut off power at the breaker and verify zero voltage before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, non-contact voltage tester. Photograph and label all wire connections before removal. Swap leads one at a time to avoid miswiring the 24V secondary.
• Warranty: 1-year OEM warranty coverage. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8UAA060155ADJA gas furnace. Also cross-references to Bryant, Payne, and Day & Night models that share the same transformer specification. Always verify your unit's data plate shows a 120V primary / 24V secondary / 40VA control transformer before ordering. Our parts team can confirm fitment — just reach out before you buy.