OEM Carrier 40VA Transformer 120V–24V for Model PG8MAA048135ADJA (HT01BC116)

This OEM control circuit transformer is the factory-specified replacement for the Carrier PG8MAA048135ADJA gas furnace. The transformer steps down 120V line voltage to 24V AC, powering the thermostat, gas valve, inducer relay, and all low-voltage control components. When this part fails, the entire control circuit goes dead — your thermostat display may go blank, the furnace won't respond to any call for heat, and no status codes will appear on the control board. Also sold under updated successor part number HT680054.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | 60 Hz | Foot-mount configuration | Wire lead connections with pre-installed insulated connectors
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances, protecting sensitive downstream components like gas valves and control boards. Generic units often run off-spec voltage, risking nuisance lockouts or damage to low-voltage circuits over time.
• Install difficulty: 2/5 — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdriver, needle-nose pliers, multimeter. Label or photograph all wire connections before removal. Discharge any residual voltage before reconnecting leads.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG8MAA048135ADJA gas furnace. Also replaces part numbers HT01BC116B, HT01BC115, HT01BC120, HT01BB126, HT01CT120, HT680054, and several additional cross-references. Verify your unit's data plate voltage and VA rating before ordering. Our fitment team is available to confirm compatibility prior to purchase — order with confidence and ship today.