OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG8DAA036070AAJA

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG8DAA036070AAJA gas furnace. It converts 120V line power to 24V to energize the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When the transformer fails, the furnace goes completely silent: no call-for-heat response, no inducer, no spark — nothing works. A failed transformer is one of the first things a technician checks when a furnace is completely unresponsive.

• Specs: Primary 120VAC | Secondary 24VAC | 40VA rated | Wire-lead connection type | OEM part HT01BC116, direct replacement HT680054
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Under-rated or off-tolerance generic units can cause nuisance lockouts, erratic thermostat behavior, or premature control board failure — costing far more than the transformer itself.
• Install difficulty: 2/5 — Always shut off the disconnect switch and verify zero voltage with a multimeter before touching wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all wire connections before removal. Total job typically takes 20–30 minutes.
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PG8DAA036070AAJA gas furnace. OEM part number HT01BC116 has been superseded by HT680054 — both are interchangeable for this application. Also fits many Bryant and Payne models sharing the same 120V–24V 40VA transformer specification. Confirm your unit's transformer specs on the data plate before ordering. Our fitment team is available to verify compatibility before you buy.